Antisense inhibitor of recql4 expression

ABSTRACT

Antisense compounds, compositions and methods are provided for modulating the expression of RECQL4. The compositions comprise antisense compounds, particularly antisense oligonucleotides, targeted to nucleic acids encoding RECQL4. Methods of using these compounds for modulation of RECQL4 expression and for treatment of diseases associated with expression of RECQL4 are provided.

FIELD OF THE INVENTION

[0001] The present invention provides compositions and methods for modulating the expression of RECQL4. In particular, this invention relates to compounds, particularly oligonucleotides, specifically hybridizable with nucleic acids encoding RECQL4. Such compounds have been shown to modulate the expression of RECQL4.

BACKGROUND OF THE INVENTION

[0002] Genomic integrity is critical to the health and survival of any organisms and cells have evolved multiple pathways for the repair of DNA damage.

[0003] One class of enzymes involved in the maintenance of genomic integrity and stability are DNA helicases. These proteins play important roles in DNA replication, repair, recombination and transcription by unwinding duplex genomic strands allowing the repair machinery access to damaged or mispaired DNA. For example, the RecQ family of helicases has been shown to be important players in linking cell cycle checkpoint responses to recombination repair (Chakraverty and Hickson, BioEssays, 1999, 21, 286-294; Frei and Gasser, J. Cell Sci., 2000, 113, 2641-2646; Wu et al., Curr. Biol., 1999, 9, R518-520). More recently, these helicases have been implicated in the process of posttranscriptional gene silencing (PTGS) (Cogoni and Macino, Science, 1999, 286, 2342-2344). In this process, the helicase is required to separate the double-stranded DNA (dsDNA) before any hybridization and silencing mechanism could be initiated.

[0004] The RecQ family consists of five members and can be divided into two distinct groups according to whether they contain an additional carboxy- or amino-terminus group. One class containing the longest members of the family include genes known to be defective in several syndromes including the BLM gene in Bloom's syndrome, the WRN gene in Werner's syndrome and the RECQ4 gene in Rothmund-Thompson syndrome. Mutations in these genes lead to an increase in the incidence of cancer as well as other physiologic abnormalities (Karow et al., Curr. Opin. Genet. Dev., 2000, 10, 32-38; Kawabe et al., Oncogene, 2000, 19, 4764-4772).

[0005] The second class contains the RECQL gene and the RECQ5 gene which encode little more than the central helicase domain and have not been associated with any human disease.

[0006] RECQL4 (also known as RecQ protein-like 4, RTS for Rothmund Thomson Syndrome and RECQ4) was cloned by Kitao et al. along with the gene for RECQ5 (Kitao et al., Genomics, 1998, 54, 443-452). A multi-tissue Northern analysis revealed that RECQL4 is predominantly expressed in the thymus and testis indicating a somewhat tissue-specific pattern of expression. The RECQL4 gene was mapped to chromosome 8q24, and chromosomal aberrations of several types have been associated with this site.

[0007] The protein and nucleic acid sequences of the human RECQL4 gene are disclosed in the European Patent Application EP0999273 and the corresponding PCT Publication WO 99/05284 (Shimamoto et al., 1999; Shimamoto et al., 2000). Also disclosed are antibodies to the RECQL4 protein, kits for diagnosing disease associated with RECQL4, transgenic and knockout animals of the RECQL4 gene and probes to the RECQL4 gene.

[0008] Kitao et al. reported that mutations in the RECQL4 gene are the cause of a subset of cases of Rothmund-Thomson syndrome, RTS (also known as poikiloderma congenitale) (Kitao et al., Nat. Genet., 1999, 22, 82-84). RTS is a rare, autosomal recessive disorder characterized by abnormalities in the skin and skeleton, juvenile cataracts, premature aging and predisposition to cancers (Kitao et al., Genomics, 1999, 61, 268-276; Lindor et al., Am. J. Med. Genet., 2000, 90, 223-228). In these studies, Kitao found 3 patients with RTS who carried two types of mutations in the RECQL4 gene. These mutations were shown to be inherited from the parents in one family and not in ethnically matched controls, suggesting that mutations of RECQL4 are responsible for only a subset of RTS cases (Kitao et al., Nat. Genet., 1999, 22, 82-84). Other types of mutations associated with the disorder include exon deletions, short string deletions, base pair changes resulting in premature termination and frameshifts.

[0009] While mutations in the RECQL4 gene are responsible for some cases of RTS, the normal function of the gene product and its regulation are still unclear. It is, however, believed to be involved in DNA metabolism, a potential therapeutic target in hyperproliferative conditions such as cancer.

[0010] Currently, there are no known therapeutic agents which effectively inhibit the synthesis of RECQL4. Consequently, there remains a long felt need for agents capable of effectively inhibiting and/or modulating RECQL4 activity.

[0011] Antisense technology is emerging as an effective means for selectively reducing the expression of specific gene products and may therefore prove to be uniquely useful in a number of therapeutic, diagnostic, and research applications for the modulation of RECQL4 expression.

[0012] The present invention provides compositions and methods for modulating RECQL4 expression.

SUMMARY OF THE INVENTION

[0013] The present invention is directed to compounds, particularly antisense oligonucleotides, which are targeted to a nucleic acid encoding RECQL4, and which modulate the expression of RECQL4. Pharmaceutical and other compositions comprising the compounds of the invention are also provided. Further provided are methods of modulating the expression of RECQL4 in cells or tissues comprising contacting said cells or tissues with one or more of the antisense compounds or compositions of the invention. Further provided are methods of treating an animal, particularly a human, suspected of having or being prone to a disease or condition associated with expression of RECQL4 by administering a therapeutically or prophylactically effective amount of one or more of the antisense compounds or compositions of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention employs oligomeric compounds, particularly antisense oligonucleotides, for use in modulating the function of nucleic acid molecules encoding RECQL4, ultimately modulating the amount of RECQL4 produced. This is accomplished by providing antisense compounds which specifically hybridize with one or more nucleic acids encoding RECQL4. As used herein, the terms “target nucleic acid” and “nucleic acid encoding RECQL4” encompass DNA encoding RECQL4, RNA (including pre-mRNA and mRNA) transcribed from such DNA, and also cDNA derived from such RNA. The specific hybridization of an oligomeric compound with its target nucleic acid interferes with the normal function of the nucleic acid. This modulation of function of a target nucleic acid by compounds which specifically hybridize to it is generally referred to as “antisense”. The functions of DNA to be interfered with include replication and transcription. The functions of RNA to be interfered with include all vital functions such as, for example, translocation of the RNA to the site of protein translation, translation of protein from the RNA, splicing of the RNA to yield one or more mRNA species, and catalytic activity which may be engaged in or facilitated by the RNA. The overall effect of such interference with target nucleic acid function is modulation of the expression of RECQL4. In the context of the present invention, “modulation” means either an increase (stimulation) or a decrease (inhibition) in the expression of a gene. In the context of the present invention, inhibition is the preferred form of modulation of gene expression and mRNA is a preferred target.

[0015] It is preferred to target specific nucleic acids for antisense. “Targeting” an antisense compound to a particular nucleic acid, in the context of this invention, is a multistep process. The process usually begins with the identification of a nucleic acid sequence whose function is to be modulated. This may be, for example, a cellular gene (or mRNA transcribed from the gene) whose expression is associated with a particular disorder or disease state, or a nucleic acid molecule from an infectious agent. In the present invention, the target is a nucleic acid molecule encoding RECQL4. The targeting process also includes determination of a site or sites within this gene for the antisense interaction to occur such that the desired effect, e.g., detection or modulation of expression of the protein, will result. Within the context of the present invention, a preferred intragenic site is the region encompassing the translation initiation or termination codon of the open reading frame (ORF) of the gene. Since, as is known in the art, the translation initiation codon is typically 5′-AUG (in transcribed mRNA molecules; 5′-ATG in the corresponding DNA molecule), the translation initiation codon is also referred to as the “AUG codon,” the “start codon” or the “AUG start codon”. A minority of genes have a translation initiation codon having the RNA sequence 5′-GUG, 5′-UUG or 5′-CUG, and 5′-AUA, 5′-ACG and 5′-CUG have been shown to function in vivo. Thus, the terms “translation initiation codon” and “start codon” can encompass many codon sequences, even though the initiator amino acid in each instance is typically methionine (in eukaryotes) or formylmethionine (in prokaryotes). It is also known in the art that eukaryotic and prokaryotic genes may have two or more alternative start codons, any one of which may be preferentially utilized for translation initiation in a particular cell type or tissue, or under a particular set of conditions. In the context of the invention, “start codon” and “translation initiation codon” refer to the codon or codons that are used in vivo to initiate translation of an mRNA molecule transcribed from a gene encoding RECQL4, regardless of the sequence(s) of such codons.

[0016] It is also known in the art that a translation termination codon (or “stop codon”) of a gene may have one of three sequences, i.e., 5′-UAA, 5′-UAG and 5′-UGA (the corresponding DNA sequences are 5′-TAA, 5′-TAG and 5′-TGA, respectively). The terms “start codon region” and “translation initiation codon region” refer to a portion of such an mRNA or gene that encompasses from about 25 to about 50 contiguous nucleotides in either direction (i.e., 5′ or 3′) from a translation initiation codon. Similarly, the terms “stop codon region” and “translation termination codon region” refer to a portion of such an mRNA or gene that encompasses from about 25 to about 50 contiguous nucleotides in either direction (i.e., 5′ or 3′) from a translation termination codon.

[0017] The open reading frame (ORF) or “coding region,” which is known in the art to refer to the region between the translation initiation codon and the translation termination codon, is also a region which may be targeted effectively. Other target regions include the 5′ untranslated region (5′UTR), known in the art to refer to the portion of an mRNA in the 5′ direction from the translation initiation codon, and thus including nucleotides between the 5′ cap site and the translation initiation codon of an mRNA or corresponding nucleotides on the gene, and the 3′ untranslated region (3′UTR), known in the art to refer to the portion of an mRNA in the 3′ direction from the translation termination codon, and thus including nucleotides between the translation termination codon and 3′ end of an mRNA or corresponding nucleotides on the gene. The 5′ cap of an MRNA comprises an N7-methylated guanosine residue joined to the 5′-most residue of the mRNA via a 5′-5′ triphosphate linkage. The 5′ cap region of an mRNA is considered to include the 5′ cap structure itself as well as the first 50 nucleotides adjacent to the cap. The 5′ cap region may also be a preferred target region.

[0018] Although some eukaryotic mRNA transcripts are directly translated, many contain one or more regions, known as “introns,” which are excised from a transcript before it is translated. The remaining (and therefore translated) regions are known as “exons” and are spliced together to form a continuous mRNA sequence. mRNA splice sites, i.e., intron-exon junctions, may also be preferred target regions, and are particularly useful in situations where aberrant splicing is implicated in disease, or where an overproduction of a particular mRNA splice product is implicated in disease. Aberrant fusion junctions due to rearrangements or deletions are also preferred targets. It has also been found that introns can also be effective, and therefore preferred, target regions for antisense compounds targeted, for example, to DNA or pre-mRNA.

[0019] Once one or more target sites have been identified, oligonucleotides are chosen which are sufficiently complementary to the target, i.e., hybridize sufficiently well and with sufficient specificity, to give the desired effect.

[0020] In the context of this invention, “hybridization” means hydrogen bonding, which may be Watson-Crick, Hoogsteen or reversed Hoogsteen hydrogen bonding, between complementary nucleoside or nucleotide bases. For example, adenine and thymine are complementary nucleobases which pair through the formation of hydrogen bonds. “Complementary,” as used herein, refers to the capacity for precise pairing between two nucleotides. For example, if a nucleotide at a certain position of an oligonucleotide is capable of hydrogen bonding with a nucleotide at the same position of a DNA or RNA molecule, then the oligonucleotide and the DNA or RNA are considered to be complementary to each other at that position. The oligonucleotide and the DNA or RNA are complementary to each other when a sufficient number of corresponding positions in each molecule are occupied by nucleotides which can hydrogen bond with each other. Thus, “specifically hybridizable” and “complementary” are terms which are used to indicate a sufficient degree of complementarity or precise pairing such that stable and specific binding occurs between the oligonucleotide and the DNA or RNA target. It is understood in the art that the sequence of an antisense compound need not be 100% complementary to that of its target nucleic acid to be specifically hybridizable. An antisense compound is specifically hybridizable when binding of the compound to the target DNA or RNA molecule interferes with the normal function of the target DNA or RNA to cause a loss of utility, and there is a sufficient degree of complementarity to avoid non-specific binding of the antisense compound to non-target sequences under conditions in which specific binding is desired, i.e., under physiological conditions in the case of in vivo assays or therapeutic treatment, and in the case of in vitro assays, under conditions in which the assays are performed.

[0021] Antisense and other compounds of the invention which hybridize to the target and inhibit expression of the target are identified through experimentation, and the sequences of these compounds are hereinbelow identified as preferred embodiments of the invention. The target sites to which these preferred sequences are complementary are hereinbelow referred to as “active sites” and are therefore preferred sites for targeting. Therefore another embodiment of the invention encompasses compounds which hybridize to these active sites.

[0022] Antisense compounds are commonly used as research reagents and diagnostics. For example, antisense oligonucleotides, which are able to inhibit gene expression with exquisite specificity, are often used by those of ordinary skill to elucidate the function of particular genes. Antisense compounds are also used, for example, to distinguish between functions of various members of a biological pathway. Antisense modulation has, therefore, been harnessed for research use.

[0023] For use in kits and diagnostics, the antisense compounds of the present invention, either alone or in combination with other antisense compounds or therapeutics, can be used as tools in differential and/or combinatorial analyses to elucidate expression patterns of a portion or the entire complement of genes expressed within cells and tissues.

[0024] Expression patterns within cells or tissues treated with one or more antisense compounds are compared to control cells or tissues not treated with antisense compounds and the patterns produced are analyzed for differential levels of gene expression as they pertain, for example, to disease association, signaling pathway, cellular localization, expression level, size, structure or function of the genes examined. These analyses can be performed on stimulated or unstimulated cells and in the presence or absence of other compounds which affect expression patterns.

[0025] Examples of methods of gene expression analysis known in the art include DNA arrays or microarrays (Brazma and Vilo, FEBS Lett., 2000, 480, 17-24; Celis, et al., FEBS Lett., 2000, 480, 2-16), SAGE (serial analysis of gene expression)(Madden, et al., Drug Discov. Today, 2000, 5, 415-425), READS (restriction enzyme amplification of digested cDNAs) (Prashar and Weissman, Methods Enzymol., 1999, 303, 258-72), TOGA (total gene expression analysis) (Sutcliffe, et al., Proc. Natl. Acad. Sci. U.S.A., 2000, 97, 1976-81), protein arrays and proteomics (Celis, et al., FEBS Lett., 2000, 480, 2-16; Jungblut, et al., Electrophoresis, 1999, 20, 2100-10), expressed sequence tag (EST) sequencing (Celis, et al., FEBS Lett., 2000, 480, 2-16; Larsson, et al., J. Biotechnol., 2000, 80, 143-57), subtractive RNA fingerprinting (SuRF) (Fuchs, et al., Anal. Biochem., 2000, 286, 91-98; Larson, et al., Cytometry, 2000, 41, 203-208), subtractive cloning, differential display (DD) (Jurecic and Belmont, Curr. Opin. Microbiol., 2000, 3, 316-21), comparative genomic hybridization (Carulli, et al., J. Cell Biochem. Suppl., 1998, 31, 286-96), FISH (fluorescent in situ hybridization) techniques (Going and Gusterson, Eur. J. Cancer, 1999, 35, 1895-904) and mass spectrometry methods (reviewed in (To, Comb. Chem. High Throughput Screen, 2000, 3, 235-41).

[0026] The specificity and sensitivity of antisense is also harnessed by those of skill in the art for therapeutic uses. Antisense oligonucleotides have been employed as therapeutic moieties in the treatment of disease states in animals and man. Antisense oligonucleotide drugs, including ribozymes, have been safely and effectively administered to humans and numerous clinical trials are presently underway. It is thus established that oligonucleotides can be useful therapeutic modalities that can be configured to be useful in treatment regimes for treatment of cells, tissues and animals, especially humans.

[0027] In the context of this invention, the term “oligonucleotide” refers to an oligomer or polymer of ribonucleic acid (RNA) or deoxyribonucleic acid (DNA) or mimetics thereof. This term includes oligonucleotides composed of naturally-occurring nucleobases, sugars and covalent internucleoside (backbone) linkages as well as oligonucleotides having non-naturally-occurring portions which function similarly. Such modified or substituted oligonucleotides are often preferred over native forms because of desirable properties such as, for example, enhanced cellular uptake, enhanced affinity for nucleic acid target and increased stability in the presence of nucleases.

[0028] While antisense oligonucleotides are a preferred form of antisense compound, the present invention comprehends other oligomeric antisense compounds, including but not limited to oligonucleotide mimetics such as are described below. The antisense compounds in accordance with this invention preferably comprise from about 8 to about 50 nucleobases (i.e. from about 8 to about 50 linked nucleosides). Particularly preferred antisense compounds are antisense oligonucleotides, even more preferably those comprising from about 12 to about 30 nucleobases. Antisense compounds include ribozymes, external guide sequence (EGS) oligonucleotides (oligozymes), and other short catalytic RNAs or catalytic oligonucleotides which hybridize to the target nucleic acid and modulate its expression.

[0029] As is known in the art, a nucleoside is a base-sugar combination. The base portion of the nucleoside is normally a heterocyclic base. The two most common classes of such heterocyclic bases are the purines and the pyrimidines. Nucleotides are nucleosides that further include a phosphate group covalently linked to the sugar portion of the nucleoside. For those nucleosides that include a pentofuranosyl sugar, the phosphate group can be linked to either the 2′, 3′ or 5′ hydroxyl moiety of the sugar. In forming oligonucleotides, the phosphate groups covalently link adjacent nucleosides to one another to form a linear polymeric compound. In turn the respective ends of this linear polymeric structure can be further joined to form a circular structure, however, open linear structures are generally preferred. Within the oligonucleotide structure, the phosphate groups are commonly referred to as forming the internucleoside backbone of the oligonucleotide. The normal linkage or backbone of RNA and DNA is a 3′ to 5′ phosphodiester linkage.

[0030] Specific examples of preferred antisense compounds useful in this invention include oligonucleotides containing modified backbones or non-natural internucleoside linkages. As defined in this specification, oligonucleotides having modified backbones include those that retain a phosphorus atom in the backbone and those that do not have a phosphorus atom in the backbone. For the purposes of this specification, and as sometimes referenced in the art, modified oligonucleotides that do not have a phosphorus atom in their internucleoside backbone can also be considered to be oligonucleosides.

[0031] Preferred modified oligonucleotide backbones include, for example, phosphorothioates, chiral phosphorothioates, phosphorodithioates, phosphotriesters, aminoalkylphosphotri-esters, methyl and other alkyl phosphonates including 3′-alkylene phosphonates, 5′-alkylene phosphonates and chiral phosphonates, phosphinates, phosphoramidates including 3′-amino phosphoramidate and aminoalkylphosphoramidates, thionophosphoramidates, thionoalkylphosphonates, thionoalkylphosphotriesters, selenophosphates and borano-phosphates having normal 3′-5′ linkages, 2′-5′ linked analogs of these, and those having inverted polarity wherein one or more internucleotide linkages is a 3′ to 3′, 5′ to 5′ or 2′ to 2′ linkage. Preferred oligonucleotides having inverted polarity comprise a single 3′ to 3′ linkage at the 3′-most internucleotide linkage i.e. a single inverted nucleoside residue which may be abasic (the nucleobase is missing or has a hydroxyl group in place thereof). Various salts, mixed salts and free acid forms are also included.

[0032] Representative United States patents that teach the preparation of the above phosphorus-containing linkages include, but are not limited to, U.S. Pat. Nos.: 3,687,808; 4,469,863; 4,476,301; 5,023,243; 5,177,196; 5,188,897; 5,264,423; 5,276,019; 5,278,302; 5,286,717; 5,321,131; 5,399,676; 5,405,939; 5,453,496; 5,455,233; 5,466,677; 5,476,925; 5,519,126; 5,536,821; 5,541,306; 5,550,111; 5,563,253; 5,571,799; 5,587,361; 5,194,599; 5,565,555; 5,527,899; 5,721,218; 5,672,697 and 5,625,050, certain of which are commonly owned with this application, and each of which is herein incorporated by reference.

[0033] Preferred modified oligonucleotide backbones that do not include a phosphorus atom therein have backbones that are formed by short chain alkyl or cycloalkyl internucleoside linkages, mixed heteroatom and alkyl or cycloalkyl internucleoside linkages, or one or more short chain heteroatomic or heterocyclic internucleoside linkages. These include those having morpholino linkages (formed in part from the sugar portion of a nucleoside); siloxane backbones; sulfide, sulfoxide and sulfone backbones; formacetyl and thioformacetyl backbones; methylene formacetyl and thioformacetyl backbones; riboacetyl backbones; alkene containing backbones; sulfamate backbones; methyleneimino and methylenehydrazino backbones; sulfonate and sulfonamide backbones; amide backbones; and others having mixed N, O, S and CH₂ component parts.

[0034] Representative United States patents that teach the preparation of the above oligonucleosides include, but are not limited to, U.S. Pat. Nos. : 5,034,506; 5,166,315; 5,185,444; 5,214,134; 5,216,141; 5,235,033; 5,264,562; 5,264,564; 5,405,938; 5,434,257; 5,466,677; 5,470,967; 5,489,677; 5,541,307; 5,561,225; 5,596,086; 5,602,240; 5,610,289; 5,602,240; 5,608,046; 5,610,289; 5,618,704; 5,623,070; 5,663,312; 5,633,360; 5,677,437; 5,792,608; 5,646,269 and 5,677,439, certain of which are commonly owned with this application, and each of which is herein incorporated by reference.

[0035] In other preferred oligonucleotide mimetics, both the sugar and the internucleoside linkage, i.e., the backbone, of the nucleotide units are replaced with novel groups. The base units are maintained for hybridization with an appropriate nucleic acid target compound. One such oligomeric compound, an oligonucleotide mimetic that has been shown to have excellent hybridization properties, is referred to as a peptide nucleic acid (PNA). In PNA compounds, the sugar-backbone of an oligonucleotide is replaced with an amide containing backbone, in particular an aminoethylglycine backbone. The nucleobases are retained and are bound directly or indirectly to aza nitrogen atoms of the amide portion of the backbone. Representative United States patents that teach the preparation of PNA compounds include, but are not limited to, U.S. Pat. Nos.: 5,539,082; 5,714,331; and 5,719,262, each of which is herein incorporated by reference. Further teaching of PNA compounds can be found in Nielsen et al., Science, 1991, 254, 1497-1500.

[0036] Most preferred embodiments of the invention are oligonucleotides with phosphorothioate backbones and oligonucleosides with heteroatom backbones, and in particular —CH₂—NH—O—CH₂—, —CH₂—N(CH₃)—O—CH₂— [known as a methylene (methylimino) or MMI backbone], —CH₂—O—N(CH₃)—CH₂—, —CH₂—N(CH₃)—N(CH₃)—CH₂— and —O—N(CH₃)—CH₂—CH₂— [wherein the native phosphodiester backbone is represented as —O—P—O—CH₂—] of the above referenced U.S. Pat. No. 5,489,677, and the amide backbones of the above referenced U.S. Pat. No. 5,602,240. Also preferred are oligonucleotides having morpholino backbone structures of the above-referenced U.S. Pat. No. 5,034,506.

[0037] Modified oligonucleotides may also contain one or more substituted sugar moieties. Preferred oligonucleotides comprise one of the following at the 2′ position: OH; F; O—, S—, or N-alkyl; O—, S—, or N-alkenyl; O—, S— or N-alkynyl; or O-alkyl-O-alkyl, wherein the alkyl, alkenyl and alkynyl may be substituted or unsubstituted C₁ to C₁₀ alkyl or C₂ to C₁₀ alkenyl and alkynyl. Particularly preferred are O[(CH₂)_(n)O]_(m)CH₃, O(CH₂ )_(n)OCH₃, O(CH₂)_(n)NH₂, O(CH₂)_(n)CH₃, O(CH₂)_(n)ONH₂, and O(CH₂)_(n)ON[(CH₂)_(n)CH₃)]₂ where n and m are from 1 to about 10. Other preferred oligonucleotides comprise one of the following at the 2′ position: C₁ to C₁₀ lower alkyl, substituted lower alkyl, alkenyl, alkynyl, alkaryl, aralkyl, O-alkaryl or O-aralkyl, SH, SCH₃, OCN, Cl, Br, CN, CF₃, OCF₃, SOCH₃, SO₂CH₃, ONO₂, NO₂, N₃, NH₂, heterocycloalkyl, heterocycloalkaryl, aminoalkylamino, polyalkylamino, substituted silyl, an RNA cleaving group, a reporter group, an intercalator, a group for improving the pharmacokinetic properties of an oligonucleotide, or a group for improving the pharmacodynamic properties of an oligonucleotide, and other substituents having similar properties. A preferred modification includes 2′-methoxyethoxy (2′—O—CH₂CH₂OCH₃, also known as 2′—O—(2-methoxyethyl) or 2′-MOE) (Martin et al., Helv. Chim. Acta, 1995, 78, 486-504) i.e., an alkoxyalkoxy group. A further preferred modification includes 2′-dimethylaminooxyethoxy, i.e., a O(CH₂)₂ON(CH₃)₂ group, also known as 2′-DMAOE, as described in examples hereinbelow, and 2′-dimethylaminoethoxyethoxy (also known in the art as 2′-O-dimethylaminoethoxyethyl or 2′-DMAEOE), i.e., 2′-O—CH₂—O—CH₂—N(CH₂)₂, also described in examples hereinbelow.

[0038] A further prefered modification includes Locked Nucleic Acids (LNAs) in which the 2′-hydroxyl group is linked to the 3′ or 4′ carbon atom of the sugar ring thereby forming a bicyclic sugar moiety. The linkage is preferably a methelyne (—CH₂—)_(n) group bridging the 2′ oxygen atom and the 4′ carbon atom wherein n is 1 or 2. LNAs and preparation thereof are described in WO 98/39352 and WO 99/14226.

[0039] Other preferred modifications include 2′-methoxy (2′-O—CH₃), 2′-aminopropoxy (2′-OCH₂CH₂CH₂NH₂), 2′-allyl (2′-CH₂—CH═CH₂), 2′—O—allyl (2′—O—CH₂—CH═CH₂) and 2′-fluoro (2′—F). The 2′-modification may be in the arabino (up) position or ribo (down) position. A preferred 2′-arabino modification is 2′-F. Similar modifications may also be made at other positions on the oligonucleotide, particularly the 3′ position of the sugar on the 3′ terminal nucleotide or in 2′-5′ linked oligonucleotides and the 5′ position of 5′ terminal nucleotide. Oligonucleotides may also have sugar mimetics such as cyclobutyl moieties in place of the pentofuranosyl sugar. Representative United States patents that teach the preparation of such modified sugar structures include, but are not limited to, U.S. Pat. Nos.: 4,981,957; 5,118,800; 5,319,080; 5,359,044; 5,393,878; 5,446,137; 5,466,786; 5,514,785; 5,519,134; 5,567,811; 5,576,427; 5,591,722; 5,597,909; 5,610,300; 5,627,053; 5,639,873; 5,646,265; 5,658,873; 5,670,633; 5,792,747; and 5,700,920, certain of which are commonly owned with the instant application, and each of which is herein incorporated by reference in its entirety.

[0040] Oligonucleotides may also include nucleobase (often referred to in the art simply as “base”) modifications or substitutions. As used herein, “unmodified” or “natural” nucleobases include the purine bases adenine (A) and guanine (G), and the pyrimidine bases thymine (T), cytosine (C) and uracil (U). Modified nucleobases include other synthetic and natural nucleobases such as 5-methylcytosine (5-me-C), 5-hydroxymethyl cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives of adenine and guanine, 2-propyl and other alkyl derivatives of adenine and guanine, 2-thiouracil, 2-thiothymine and 2-thiocytosine, 5-halouracil and cytosine, 5-propynyl (—C≡C—CH₃) uracil and cytosine and other alkynyl derivatives of pyrimidine bases, 6-azo uracil, cytosine and thymine, 5-uracil (pseudouracil), 4-thiouracil, 8-halo, 8-amino, 8-thiol, 8-thioalkyl, 8-hydroxyl and other 8-substituted adenines and guanines, 5-halo particularly 5-bromo, 5-trifluoromethyl and other 5-substituted uracils and cytosines, 7-methylguanine and 7-methyladenine, 2-F-adenine, 2-amino-adenine, 8-azaguanine and 8-azaadenine, 7-deazaguanine and 7-deazaadenine and 3-deazaguanine and 3-deazaadenine. Further modified nucleobases include tricyclic pyrimidines such as phenoxazine cytidine(1H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one), phenothiazine cytidine (lH-pyrimido[5,4-b][1,4]benzothiazin-2(3H)-one), G-clamps such as a substituted phenoxazine cytidine (e.g. 9-(2-aminoethoxy)-H-pyrimido[5,4-b][1,4]benzoxazin-2(3H)-one), carbazole cytidine (2H-pyrimido[4,5-b]indol-2-one), pyridoindole cytidine (H-pyrido[3′,2′:4,5]pyrrolo[2,3-d]pyrimidin-2-one). Modified nucleobases may also include those in which the purine or pyrimidine base is replaced with other heterocycles, for example 7-deaza-adenine, 7-deazaguanosine, 2-aminopyridine and 2-pyridone. Further nucleobases include those disclosed in U.S. Pat. No. 3,687,808, those disclosed in The Concise Encyclopedia Of Polymer Science And Engineering, pages 858-859, Kroschwitz, J. I., ed. John Wiley & Sons, 1990, those disclosed by Englisch et al., Angewandte Chemie, International Edition, 1991, 30, 613, and those disclosed by Sanghvi, Y. S., Chapter 15, Antisense Research and Applications, pages 289-302, Crooke, S. T. and Lebleu, B. ed., CRC Press, 1993. Certain of these nucleobases are particularly useful for increasing the binding affinity of the oligomeric compounds of the invention. These include 5-substituted pyrimidines, 6-azapyrimidines and N-2, N-6 and O-6 substituted purines, including 2-aminopropyladenine, 5-propynyluracil and 5-propynylcytosine. 5-methylcytosine substitutions have been shown to increase nucleic acid duplex stability by 0.6-1.2° C. (Sanghvi, Y. S., Crooke, S. T. and Lebleu, B., eds., Antisense Research and Applications, CRC Press, Boca Raton, 1993, pp. 276-278) and are presently preferred base substitutions, even more particularly when combined with 2′-O-methoxyethyl sugar modifications.

[0041] Representative United States patents that teach the preparation of certain of the above noted modified nucleobases as well as other modified nucleobases include, but are not limited to, the above noted U.S. Pat. No. 3,687,808, as well as U.S. Pat. Nos.: 4,845,205; 5,130,302; 5,134,066; 5,175,273; 5,367,066; 5,432,272; 5,457,187; 5,459,255; 5,484,908; 5,502,177; 5,525,711; 5,552,540; 5,587,469; 5,594,121, 5,596,091; 5,614,617; 5,645,985; 5,830,653; 5,763,588; 6,005,096; and 5,681,941, certain of which are commonly owned with the instant application, and each of which is herein incorporated by reference, and U.S. Pat. No. 5,750,692, which is commonly owned with the instant application and also herein incorporated by reference.

[0042] Another modification of the oligonucleotides of the invention involves chemically linking to the oligonucleotide one or more moieties or conjugates which enhance the activity, cellular distribution or cellular uptake of the oligonucleotide. The compounds of the invention can include conjugate groups covalently bound to functional groups such as primary or secondary hydroxyl groups. Conjugate groups of the invention include intercalators, reporter molecules, polyamines, polyamides, polyethylene glycols, polyethers, groups that enhance the pharmacodynamic properties of oligomers, and groups that enhance the pharmacokinetic properties of oligomers. Typical conjugates groups include cholesterols, lipids, phospholipids, biotin, phenazine, folate, phenanthridine, anthraquinone, acridine, fluoresceins, rhodamines, coumarins, and dyes. Groups that enhance the pharmacodynamic properties, in the context of this invention, include groups that improve oligomer uptake, enhance oligomer resistance to degradation, and/or strengthen sequence-specific hybridization with RNA. Groups that enhance the pharmacokinetic properties, in the context of this invention, include groups that improve oligomer uptake, distribution, metabolism or excretion. Representative conjugate groups are disclosed in International Patent Application PCT/US92/09196, filed Oct. 23, 1992 the entire disclosure of which is incorporated herein by reference. Conjugate moieties include but are not limited to lipid moieties such as a cholesterol moiety (Letsinger et al., Proc. Natl. Acad. Sci. USA, 1989, 86, 6553-6556), cholic acid (Manoharan et al., Bioorg. Med. Chem. Let., 1994, 4, 1053-1060), a thioether, e.g., hexyl-S-tritylthiol (Manoharan et al., Ann. N.Y. Acad. Sci., 1992, 660, 306-309; Manoharan et al., Bioorg. Med. Chem. Let., 1993, 3, 2765-2770), a thiocholesterol (Oberhauser et al., Nucl. Acids Res., 1992, 20, 533-538), an aliphatic chain, e.g., dodecandiol or undecyl residues (Saison-Behmoaras et al., EMBO J., 1991, 10, 1111-1118; Kabanov et al., FEBS Lett., 1990, 259, 327-330; Svinarchuk et al., Biochimie, 1993, 75, 49-54), a phospholipid, e.g., di-hexadecyl-rac-glycerol or triethyl-ammonium 1,2-di-O-hexadecyl-rac-glycero-3-H-phosphonate (Manoharan et al., Tetrahedron Lett., 1995, 36, 3651-3654; Shea et al., Nucl. Acids Res., 1990, 18, 3777-3783), a polyamine or a polyethylene glycol chain (Manoharan et al., Nucleosides & Nucleotides, 1995, 14, 969-973), or adamantane acetic acid (Manoharan et al., Tetrahedron Lett., 1995, 36, 3651-3654), a palmityl moiety (Mishra et al., Biochim. Biophys. Acta, 1995, 1264, 229-237), or an octadecylamine or hexylamino-carbonyl-oxycholesterol moiety (Crooke et al., J. Pharmacol. Exp. Ther., 1996, 277, 923-937. Oligonucleotides of the invention may also be conjugated to active drug substances, for example, aspirin, warfarin, phenylbutazone, ibuprofen, suprofen, fenbufen, ketoprofen, (S)-(+)-pranoprofen, carprofen, dansylsarcosine, 2,3,5-triiodobenzoic acid, flufenamic acid, folinic acid, a benzothiadiazide, chlorothiazide, a diazepine, indomethicin, a barbiturate, a cephalosporin, a sulfa drug, an antidiabetic, an antibacterial or an antibiotic. Oligonucleotide-drug conjugates and their preparation are described in U.S. patent application Ser. No. 09/334,130 (filed Jun. 15, 1999) which is incorporated herein by reference in its entirety.

[0043] Representative United States patents that teach the preparation of such oligonucleotide conjugates include, but are not limited to, U.S. Pat. Nos.: 4,828,979; 4,948,882; 5,218,105; 5,525,465; 5,541,313; 5,545,730; 5,552,538; 5,578,717, 5,580,731; 5,580,731; 5,591,584; 5,109,124; 5,118,802; 5,138,045; 5,414,077; 5,486,603; 5,512,439; 5,578,718; 5,608,046; 4,587,044; 4,605,735; 4,667,025; 4,762,779; 4,789,737; 4,824,941; 4,835,263; 4,876,335; 4,904,582; 4,958,013; 5,082,830; 5,112,963; 5,214,136; 5,082,830; 5,112,963; 5,214,136; 5,245,022; 5,254,469; 5,258,506; 5,262,536; 5,272,250; 5,292,873; 5,317,098; 5,371,241, 5,391,723; 5,416,203, 5,451,463; 5,510,475; 5,512,667; 5,514,785; 5,565,552; 5,567,810; 5,574,142; 5,585,481; 5,587,371; 5,595,726; 5,597,696; 5,599,923; 5,599,928 and 5,688,941, certain of which are commonly owned with the instant application, and each of which is herein incorporated by reference.

[0044] It is not necessary for all positions in a given compound to be uniformly modified, and in fact more than one of the aforementioned modifications may be incorporated in a single compound or even at a single nucleoside within an oligonucleotide. The present invention also includes antisense compounds which are chimeric compounds. “Chimeric” antisense compounds or “chimeras,” in the context of this invention, are antisense compounds, particularly oligonucleotides, which contain two or more chemically distinct regions, each made up of at least one monomer unit, i.e., a nucleotide in the case of an oligonucleotide compound. These oligonucleotides typically contain at least one region wherein the oligonucleotide is modified so as to confer upon the oligonucleotide increased resistance to nuclease degradation, increased cellular uptake, and/or increased binding affinity for the target nucleic acid. An additional region of the oligonucleotide may serve as a substrate for enzymes capable of cleaving RNA:DNA or RNA:RNA hybrids. By way of example, RNase H is a cellular endonuclease which cleaves the RNA strand of an RNA:DNA duplex. Activation of RNase H, therefore, results in cleavage of the RNA target, thereby greatly enhancing the efficiency of oligonucleotide inhibition of gene expression. Consequently, comparable results can often be obtained with shorter oligonucleotides when chimeric oligonucleotides are used, compared to phosphorothioate deoxyoligonucleotides hybridizing to the same target region. Cleavage of the RNA target can be routinely detected by gel electrophoresis and, if necessary, associated nucleic acid hybridization techniques known in the art.

[0045] Chimeric antisense compounds of the invention may be formed as composite structures of two or more oligonucleotides, modified oligonucleotides, oligonucleosides and/or oligonucleotide mimetics as described above. Such compounds have also been referred to in the art as hybrids or gapmers. Representative United States patents that teach the preparation of such hybrid structures include, but are not limited to, U.S. Pat. Nos.: 5,013,830; 5,149,797; 5,220,007; 5,256,775; 5,366,878; 5,403,711; 5,491,133; 5,565,350; 5,623,065; 5,652,355; 5,652,356; and 5,700,922, certain of which are commonly owned with the instant application, and each of which is herein incorporated by reference in its entirety.

[0046] The antisense compounds used in accordance with this invention may be conveniently and routinely made through the well-known technique of solid phase synthesis. Equipment for such synthesis is sold by several vendors including, for example, Applied Biosystems (Foster City, Calif.). Any other means for such synthesis known in the art may additionally or alternatively be employed. It is well known to use similar techniques to prepare oligonucleotides such as the phosphorothioates and alkylated derivatives.

[0047] The antisense compounds of the invention are synthesized in vitro and do not include antisense compositions of biological origin, or genetic vector constructs designed to direct the in vivo synthesis of antisense molecules. The compounds of the invention may also be admixed, encapsulated, conjugated or otherwise associated with other molecules, molecule structures or mixtures of compounds, as for example, liposomes, receptor targeted molecules, oral, rectal, topical or other formulations, for assisting in uptake, distribution and/or absorption. Representative United States patents that teach the preparation of such uptake, distribution and/or absorption assisting formulations include, but are not limited to, U.S. Pat. Nos.: 5,108,921; 5,354,844; 5,416,016; 5,459,127; 5,521,291; 5,543,158; 5,547,932; 5,583,020; 5,591,721; 4,426,330; 4,534,899; 5,013,556; 5,108,921; 5,213,804; 5,227,170; 5,264,221; 5,356,633; 5,395,619; 5,416,016; 5,417,978; 5,462,854; 5,469,854; 5,512,295; 5,527,528; 5,534,259; 5,543,152; 5,556,948; 5,580,575; and 5,595,756, each of which is herein incorporated by reference.

[0048] The antisense compounds of the invention encompass any pharmaceutically acceptable salts, esters, or salts of such esters, or any other compound which, upon administration to an animal including a human, is capable of providing (directly or indirectly) the biologically active metabolite or residue thereof. Accordingly, for example, the disclosure is also drawn to prodrugs and pharmaceutically acceptable salts of the compounds of the invention, pharmaceutically acceptable salts of such prodrugs, and other bioequivalents.

[0049] The term “prodrug” indicates a therapeutic agent that is prepared in an inactive form that is converted to an active form (i.e., drug) within the body or cells thereof by the action of endogenous enzymes or other chemicals and/or conditions. In particular, prodrug versions of the oligonucleotides of the invention are prepared as SATE [(S-acetyl-2-thioethyl) phosphate] derivatives according to the methods disclosed in WO 93/24510 to Gosselin et al., published Dec. 9, 1993 or in WO 94/26764 and U.S. Pat. No. 5,770,713 to Imbach et al.

[0050] The term “pharmaceutically acceptable salts” refers to physiologically and pharmaceutically acceptable salts of the compounds of the invention: i.e., salts that retain the desired biological activity of the parent compound and do not impart undesired toxicological effects thereto.

[0051] Pharmaceutically acceptable base addition salts are formed with metals or amines, such as alkali and alkaline earth metals or organic amines. Examples of metals used as cations are sodium, potassium, magnesium, calcium, and the like. Examples of suitable amines are N,N′-dibenzylethylenediamine, chloroprocaine, choline, diethanolamine, dicyclohexylamine, ethylenediamine, N-methylglucamine, and procaine (see, for example, Berge et al., “Pharmaceutical Salts,” J. of Pharma Sci., 1977, 66, 1-19). The base addition salts of said acidic compounds are prepared by contacting the free acid form with a sufficient amount of the desired base to produce the salt in the conventional manner. The free acid form may be regenerated by contacting the salt form with an acid and isolating the free acid in the conventional manner. The free acid forms differ from their respective salt forms somewhat in certain physical properties such as solubility in polar solvents, but otherwise the salts are equivalent to their respective free acid for purposes of the present invention. As used herein, a “pharmaceutical addition salt” includes a pharmaceutically acceptable salt of an acid form of one of the components of the compositions of the invention. These include organic or inorganic acid salts of the amines. Preferred acid salts are the hydrochlorides, acetates, salicylates, nitrates and phosphates. Other suitable pharmaceutically acceptable salts are well known to those skilled in the art and include basic salts of a variety of inorganic and organic acids, such as, for example, with inorganic acids, such as for example hydrochloric acid, hydrobromic acid, sulfuric acid or phosphoric acid; with organic carboxylic, sulfonic, sulfo or phospho acids or N-substituted sulfamic acids, for example acetic acid, propionic acid, glycolic acid, succinic acid, maleic acid, hydroxymaleic acid, methylmaleic acid, fumaric acid, malic acid, tartaric acid, lactic acid, oxalic acid, gluconic acid, glucaric acid, glucuronic acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, salicylic acid, 4-aminosalicylic acid, 2-phenoxybenzoic acid, 2-acetoxybenzoic acid, embonic acid, nicotinic acid or isonicotinic acid; and with amino acids, such as the 20 alpha-amino acids involved in the synthesis of proteins in nature, for example glutamic acid or aspartic acid, and also with phenylacetic acid, methanesulfonic acid, ethanesulfonic acid, 2-hydroxyethanesulfonic acid, ethane-1,2-disulfonic acid, benzenesulfonic acid, 4-methylbenzenesulfonic acid, naphthalene-2-sulfonic acid, naphthalene-1,5-disulfonic acid, 2- or 3-phosphoglycerate, glucose-6-phosphate, N-cyclohexylsulfamic acid (with the formation of cyclamates), or with other acid organic compounds, such as ascorbic acid. Pharmaceutically acceptable salts of compounds may also be prepared with a pharmaceutically acceptable cation. Suitable pharmaceutically acceptable cations are well known to those skilled in the art and include alkaline, alkaline earth, ammonium and quaternary ammonium cations. Carbonates or hydrogen carbonates are also possible.

[0052] For oligonucleotides, preferred examples of pharmaceutically acceptable salts include but are not limited to (a) salts formed with cations such as sodium, potassium, ammonium, magnesium, calcium, polyamines such as spermine and spermidine, etc.; (b) acid addition salts formed with inorganic acids, for example hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, nitric acid and the like; (c) salts formed with organic acids such as, for example, acetic acid, oxalic acid, tartaric acid, succinic acid, maleic acid, fumaric acid, gluconic acid, citric acid, malic acid, ascorbic acid, benzoic acid, tannic acid, palmitic acid, alginic acid, polyglutamic acid, naphthalenesulfonic acid, methanesulfonic acid, p-toluenesulfonic acid, naphthalenedisulfonic acid, polygalacturonic acid, and the like; and (d) salts formed from elemental anions such as chlorine, bromine, and iodine.

[0053] The antisense compounds of the present invention can be utilized for diagnostics, therapeutics, prophylaxis and as research reagents and kits. For therapeutics, an animal, preferably a human, suspected of having a disease or disorder which can be treated by modulating the expression of RECQL4 is treated by administering antisense compounds in accordance with this invention. The compounds of the invention can be utilized in pharmaceutical compositions by adding an effective amount of an antisense compound to a suitable pharmaceutically acceptable diluent or carrier. Use of the antisense compounds and methods of the invention may also be useful prophylactically, e.g., to prevent or delay infection, inflammation or tumor formation, for example.

[0054] The antisense compounds of the invention are useful for research and diagnostics, because these compounds hybridize to nucleic acids encoding RECQL4, enabling sandwich and other assays to easily be constructed to exploit this fact. Hybridization of the antisense oligonucleotides of the invention with a nucleic acid encoding RECQL4 can be detected by means known in the art. Such means may include conjugation of an enzyme to the oligonucleotide, radiolabelling of the oligonucleotide or any other suitable detection means. Kits using such detection means for detecting the level of RECQL4 in a sample may also be prepared.

[0055] The present invention also includes pharmaceutical compositions and formulations which include the antisense compounds of the invention. The pharmaceutical compositions of the present invention may be administered in a number of ways depending upon whether local or systemic treatment is desired and upon the area to be treated. Administration may be topical (including ophthalmic and to mucous membranes including vaginal and rectal delivery), pulmonary, e.g., by inhalation or insufflation of powders or aerosols, including by nebulizer; intratracheal, intranasal, epidermal and transdermal), oral or parenteral. Parenteral administration includes intravenous, intraarterial, subcutaneous, intraperitoneal or intramuscular injection or infusion; or intracranial, e.g., intrathecal or intraventricular, administration. Oligonucleotides with at least one 2′-O-methoxyethyl modification are believed to be particularly useful for oral administration.

[0056] Pharmaceutical compositions and formulations for topical administration may include transdermal patches, ointments, lotions, creams, gels, drops, suppositories, sprays, liquids and powders. Conventional pharmaceutical carriers, aqueous, powder or oily bases, thickeners and the like may be necessary or desirable. Coated condoms, gloves and the like may also be useful. Preferred topical formulations include those in which the oligonucleotides of the invention are in admixture with a topical delivery agent such as lipids, liposomes, fatty acids, fatty acid esters, steroids, chelating agents and surfactants. Preferred lipids and liposomes include neutral (e.g. dioleoylphosphatidyl DOPE ethanolamine, dimyristoylphosphatidyl choline DMPC, distearolyphosphatidyl choline) negative (e.g. dimyristoylphosphatidyl glycerol DMPG) and cationic (e.g. dioleoyltetramethylaminopropyl DOTAP and dioleoylphosphatidyl ethanolamine DOTMA). Oligonucleotides of the invention may be encapsulated within liposomes or may form complexes thereto, in particular to cationic liposomes. Alternatively, oligonucleotides may be complexed to lipids, in particular to cationic lipids. Preferred fatty acids and esters include but are not limited arachidonic acid, oleic acid, eicosanoic acid, lauric acid, caprylic acid, capric acid, myristic acid, palmitic acid, stearic acid, linoleic acid, linolenic acid, dicaprate, tricaprate, monoolein, dilaurin, glyceryl 1-monocaprate, 1-dodecylazacycloheptan-2-one, an acylcarnitine, an acylcholine, or a C₁₋₁₀ alkyl ester (e.g. isopropylmyristate IPM), monoglyceride, diglyceride or pharmaceutically acceptable salt thereof. Topical formulations are described in detail in U.S. patent application Ser. No. 09/315,298 filed on May 20, 1999 which is incorporated herein by reference in its entirety.

[0057] Compositions and formulations for oral administration include powders or granules, microparticulates, nanoparticulates, suspensions or solutions in water or non-aqueous media, capsules, gel capsules, sachets, tablets or minitablets. Thickeners, flavoring agents, diluents, emulsifiers, dispersing aids or binders may be desirable. Preferred oral formulations are those in which oligonucleotides of the invention are administered in conjunction with one or more penetration enhancers surfactants and chelators. Preferred surfactants include fatty acids and/or esters or salts thereof, bile acids and/or salts thereof. Prefered bile acids/salts include chenodeoxycholic acid (CDCA) and ursodeoxychenodeoxycholic acid (UDCA), cholic acid, dehydrocholic acid, deoxycholic acid, glucholic acid, glycholic acid, glycodeoxycholic acid, taurocholic acid, taurodeoxycholic acid, sodium tauro-24,25-dihydro-fusidate, sodium glycodihydrofusidate,. Prefered fatty acids include arachidonic acid, undecanoic acid, oleic acid, lauric acid, caprylic acid, capric acid, myristic acid, palmitic acid, stearic acid, linoleic acid, linolenic acid, dicaprate, tricaprate, monoolein, dilaurin, glyceryl 1-monocaprate, 1-dodecylazacycloheptan-2-one, an acylcarnitine, an acylcholine, or a monoglyceride, a diglyceride or a pharmaceutically acceptable salt thereof (e.g. sodium). Also prefered are combinations of penetration enhancers, for example, fatty acids/salts in combination with bile acids/salts. A particularly prefered combination is the sodium salt of lauric acid, capric acid and UDCA. Further penetration enhancers include polyoxyethylene-9-lauryl ether, polyoxyethylene-20-cetyl ether. Oligonucleotides of the invention may be delivered orally in granular form including sprayed dried particles, or complexed to form micro or nanoparticles. Oligonucleotide complexing agents include poly-amino acids; polyimines; polyacrylates; polyalkylacrylates, polyoxethanes, polyalkylcyanoacrylates; cationized gelatins, albumins, starches, acrylates, polyethyleneglycols (PEG) and starches; polyalkylcyanoacrylates; DEAE-derivatized polyimines, pollulans, celluloses and starches. Particularly preferred complexing agents include chitosan, N-trimethylchitosan, poly-L-lysine, polyhistidine, polyornithine, polyspermines, protamine, polyvinylpyridine, polythiodiethylamino-methylethylene P(TDAE), polyaminostyrene (e.g. p-amino), poly(methylcyanoacrylate), poly(ethylcyanoacrylate), poly(butylcyanoacrylate), poly(isobutylcyanoacrylate), poly(isohexylcynaoacrylate), DEAE-methacrylate, DEAE-hexylacrylate, DEAE-acrylamide, DEAE-albumin and DEAE-dextran, polymethylacrylate, polyhexylacrylate, poly(D,L-lactic acid), poly(DL-lactic-co-glycolic acid (PLGA), alginate, and polyethyleneglycol (PEG). Oral formulations for oligonucleotides and their preparation are described in detail in U.S. application Ser. Nos. 08/886,829 (filed Jul. 1, 1997), 09/108,673 (filed Jul. 1, 1998), 09/256,515 (filed Feb. 23, 1999), 09/082,624 (filed May 21, 1998) and 09/315,298 (filed May 20, 1999) each of which is incorporated herein by reference in their entirety.

[0058] Compositions and formulations for parenteral, intrathecal or intraventricular administration may include sterile aqueous solutions which may also contain buffers, diluents and other suitable additives such as, but not limited to, penetration enhancers, carrier compounds and other pharmaceutically acceptable carriers or excipients.

[0059] Pharmaceutical compositions of the present invention include, but are not limited to, solutions, emulsions, and liposome-containing formulations. These compositions may be generated from a variety of components that include, but are not limited to, preformed liquids, self-emulsifying solids and self-emulsifying semisolids.

[0060] The pharmaceutical formulations of the present invention, which may conveniently be presented in unit dosage form, may be prepared according to conventional techniques well known in the pharmaceutical industry. Such techniques include the step of bringing into association the active ingredients with the pharmaceutical carrier(s) or excipient(s). In general the formulations are prepared by uniformly and intimately bringing into association the active ingredients with liquid carriers or finely divided solid carriers or both, and then, if necessary, shaping the product.

[0061] The compositions of the present invention may be formulated into any of many possible dosage forms such as, but not limited to, tablets, capsules, gel capsules, liquid syrups, soft gels, suppositories, and enemas. The compositions of the present invention may also be formulated as suspensions in aqueous, non-aqueous or mixed media. Aqueous suspensions may further contain substances which increase the viscosity of the suspension including, for example, sodium carboxymethylcellulose, sorbitol and/or dextran. The suspension may also contain stabilizers.

[0062] In one embodiment of the present invention the pharmaceutical compositions may be formulated and used as foams. Pharmaceutical foams include formulations such as, but not limited to, emulsions, microemulsions, creams, jellies and liposomes. While basically similar in nature these formulations vary in the components and the consistency of the final product. The preparation of such compositions and formulations is generally known to those skilled in the pharmaceutical and formulation arts and may be applied to the formulation of the compositions of the present invention.

[0063] Emulsions

[0064] The compositions of the present invention may be prepared and formulated as emulsions. Emulsions are typically heterogenous systems of one liquid dispersed in another in the form of droplets usually exceeding 0.1 μm in diameter. (Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199; Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., Volume 1, p. 245; Block in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 2, p. 335; Higuchi et al., in Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pa., 1985, p. 301). Emulsions are often biphasic systems comprising of two immiscible liquid phases intimately mixed and dispersed with each other. In general, emulsions may be either water-in-oil (w/o) or of the oil-in-water (o/w) variety. When an aqueous phase is finely divided into and dispersed as minute droplets into a bulk oily phase the resulting composition is called a water-in-oil (w/o) emulsion. Alternatively, when an oily phase is finely divided into and dispersed as minute droplets into a bulk aqueous phase the resulting composition is called an oil-in-water (o/w) emulsion. Emulsions may contain additional components in addition to the dispersed phases and the active drug which may be present as a solution in either the aqueous phase, oily phase or itself as a separate phase. Pharmaceutical excipients such as emulsifiers, stabilizers, dyes, and anti-oxidants may also be present in emulsions as needed. Pharmaceutical emulsions may also be multiple emulsions that are comprised of more than two phases such as, for example, in the case of oil-in-water-in-oil (o/w/o) and water-in-oil-in-water (w/o/w) emulsions. Such complex formulations often provide certain advantages that simple binary emulsions do not. Multiple emulsions in which individual oil droplets of an o/w emulsion enclose small water droplets constitute a w/o/w emulsion. Likewise a system of oil droplets enclosed in globules of water stabilized in an oily continuous provides an o/w/o emulsion.

[0065] Emulsions are characterized by little or no thermodynamic stability. Often, the dispersed or discontinuous phase of the emulsion is well dispersed into the external or continuous phase and maintained in this form through the means of emulsifiers or the viscosity of the formulation. Either of the phases of the emulsion may be a semisolid or a solid, as is the case of emulsion-style ointment bases and creams. Other means of stabilizing emulsions entail the use of emulsifiers that may be incorporated into either phase of the emulsion. Emulsifiers may broadly be classified into four categories: synthetic surfactants, naturally occurring emulsifiers, absorption bases, and finely dispersed solids (Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199).

[0066] Synthetic surfactants, also known as surface active agents, have found wide applicability in the formulation of emulsions and have been reviewed in the literature (Rieger, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 285; Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), Marcel Dekker, Inc., New York, N.Y., 1988, volume 1, p. 199). Surfactants are typically amphiphilic and comprise a hydrophilic and a hydrophobic portion. The ratio of the hydrophilic to the hydrophobic nature of the surfactant has been termed the hydrophile/lipophile balance (HLB) and is a valuable tool in categorizing and selecting surfactants in the preparation of formulations. Surfactants may be classified into different classes based on the nature of the hydrophilic group: nonionic, anionic, cationic and amphoteric (Rieger, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 285).

[0067] Naturally occurring emulsifiers used in emulsion formulations include lanolin, beeswax, phosphatides, lecithin and acacia. Absorption bases possess hydrophilic properties such that they can soak up water to form w/o emulsions yet retain their semisolid consistencies, such as anhydrous lanolin and hydrophilic petrolatum. Finely divided solids have also been used as good emulsifiers especially in combination with surfactants and in viscous preparations. These include polar inorganic solids, such as heavy metal hydroxides, nonswelling clays such as bentonite, attapulgite, hectorite, kaolin, montmorillonite, colloidal aluminum silicate and colloidal magnesium aluminum silicate, pigments and nonpolar solids such as carbon or glyceryl tristearate.

[0068] A large variety of non-emulsifying materials are also included in emulsion formulations and contribute to the properties of emulsions. These include fats, oils, waxes, fatty acids, fatty alcohols, fatty esters, humectants, hydrophilic colloids, preservatives and antioxidants (Block, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 335; Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199).

[0069] Hydrophilic colloids or hydrocolloids include naturally occurring gums and synthetic polymers such as polysaccharides (for example, acacia, agar, alginic acid, carrageenan, guar gum, karaya gum, and tragacanth), cellulose derivatives (for example, carboxymethylcellulose and carboxypropylcellulose), and synthetic polymers (for example, carbomers, cellulose ethers, and carboxyvinyl polymers). These disperse or swell in water to form colloidal solutions that stabilize emulsions by forming strong interfacial films around the dispersed-phase droplets and by increasing the viscosity of the external phase.

[0070] Since emulsions often contain a number of ingredients such as carbohydrates, proteins, sterols and phosphatides that may readily support the growth of microbes, these formulations often incorporate preservatives. Commonly used preservatives included in emulsion formulations include methyl paraben, propyl paraben, quaternary ammonium salts, benzalkonium chloride, esters of p-hydroxybenzoic acid, and boric acid. Antioxidants are also commonly added to emulsion formulations to prevent deterioration of the formulation. Antioxidants used may be free radical scavengers such as tocopherols, alkyl gallates, butylated hydroxyanisole, butylated hydroxytoluene, or reducing agents such as ascorbic acid and sodium metabisulfite, and antioxidant synergists such as citric acid, tartaric acid, and lecithin.

[0071] The application of emulsion formulations via dermatological, oral and parenteral routes and methods for their manufacture have been reviewed in the literature (Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199). Emulsion formulations for oral delivery have been very widely used because of reasons of ease of formulation, efficacy from an absorption and bioavailability standpoint. (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245; Idson, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 199). Mineral-oil base laxatives, oil-soluble vitamins and high fat nutritive preparations are among the materials that have commonly been administered orally as o/w emulsions.

[0072] In one embodiment of the present invention, the compositions of oligonucleotides and nucleic acids are formulated as microemulsions. A microemulsion may be defined as a system of water, oil and amphiphile which is a single optically isotropic and thermodynamically stable liquid solution (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245). Typically microemulsions are systems that are prepared by first dispersing an oil in an aqueous surfactant solution and then adding a sufficient amount of a fourth component, generally an intermediate chain-length alcohol to form a transparent system. Therefore, microemulsions have also been described as thermodynamically stable, isotropically clear dispersions of two immiscible liquids that are stabilized by interfacial films of surface-active molecules (Leung and Shah, in: Controlled Release of Drugs: Polymers and Aggregate Systems, Rosoff, M., Ed., 1989, VCH Publishers, New York, pages 185-215). Microemulsions commonly are prepared via a combination of three to five components that include oil, water, surfactant, cosurfactant and electrolyte. Whether the microemulsion is of the water-in-oil (w/o) or an oil-in-water (o/w) type is dependent on the properties of the oil and surfactant used and on the structure and geometric packing of the polar heads and hydrocarbon tails of the surfactant molecules (Schott, in Remington's Pharmaceutical Sciences, Mack Publishing Co., Easton, Pa., 1985, p. 271).

[0073] The phenomenological approach utilizing phase diagrams has been extensively studied and has yielded a comprehensive knowledge, to one skilled in the art, of how to formulate microemulsions (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245; Block, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 335). Compared to conventional emulsions, microemulsions offer the advantage of solubilizing water-insoluble drugs in a formulation of thermodynamically stable droplets that are formed spontaneously.

[0074] Surfactants used in the preparation of microemulsions include, but are not limited to, ionic surfactants, non-ionic surfactants, Brij 96, polyoxyethylene oleyl ethers, polyglycerol fatty acid esters, tetraglycerol monolaurate (ML310), tetraglycerol monooleate (MO310), hexaglycerol monooleate (PO310), hexaglycerol pentaoleate (PO500), decaglycerol monocaprate (MCA750), decaglycerol monooleate (MO750), decaglycerol sequioleate (SO750), decaglycerol decaoleate (DAO750), alone or in combination with cosurfactants. The cosurfactant, usually a short-chain alcohol such as ethanol, 1-propanol, and 1-butanol, serves to increase the interfacial fluidity by penetrating into the surfactant film and consequently creating a disordered film because of the void space generated among surfactant molecules. Microemulsions may, however, be prepared without the use of cosurfactants and alcohol-free self-emulsifying microemulsion systems are known in the art. The aqueous phase may typically be, but is not limited to, water, an aqueous solution of the drug, glycerol, PEG300, PEG400, polyglycerols, propylene glycols, and derivatives of ethylene glycol. The oil phase may include, but is not limited to, materials such as Captex 300, Captex 355, Capmul MCM, fatty acid esters, medium chain (C8-C12) mono, di, and tri-glycerides, polyoxyethylated glyceryl fatty acid esters, fatty alcohols, polyglycolized glycerides, saturated polyglycolized C8-C10 glycerides, vegetable oils and silicone oil.

[0075] Microemulsions are particularly of interest from the standpoint of drug solubilization and the enhanced absorption of drugs. Lipid based microemulsions (both o/w and w/o) have been proposed to enhance the oral bioavailability of drugs, including peptides (Constantinides et al., Pharmaceutical Research, 1994, 11, 1385-1390; Ritschel, Meth. Find. Exp. Clin. Pharmacol., 1993, 13, 205). Microemulsions afford advantages of improved drug solubilization, protection of drug from enzymatic hydrolysis, possible enhancement of drug absorption due to surfactant-induced alterations in membrane fluidity and permeability, ease of preparation, ease of oral administration over solid dosage forms, improved clinical potency, and decreased toxicity (Constantinides et al., Pharmaceutical Research, 1994, 11, 1385; Ho et al., J. Pharm. Sci., 1996, 85, 138-143). Often microemulsions may form spontaneously when their components are brought together at ambient temperature. This may be particularly advantageous when formulating thermolabile drugs, peptides or oligonucleotides. Microemulsions have also been effective in the transdermal delivery of active components in both cosmetic and pharmaceutical applications. It is expected that the microemulsion compositions and formulations of the present invention will facilitate the increased systemic absorption of oligonucleotides and nucleic acids from the gastrointestinal tract, as well as improve the local cellular uptake of oligonucleotides and nucleic acids within the gastrointestinal tract, vagina, buccal cavity and other areas of administration.

[0076] Microemulsions of the present invention may also contain additional components and additives such as sorbitan monostearate (Grill 3), Labrasol, and penetration enhancers to improve the properties of the formulation and to enhance the absorption of the oligonucleotides and nucleic acids of the present invention. Penetration enhancers used in the microemulsions of the present invention may be classified as belonging to one of five broad categories—surfactants, fatty acids, bile salts, chelating agents, and non-chelating non-surfactants (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p. 92). Each of these classes has been discussed above.

[0077] Liposomes

[0078] There are many organized surfactant structures besides microemulsions that have been studied and used for the formulation of drugs. These include monolayers, micelles, bilayers and vesicles. Vesicles, such as liposomes, have attracted great interest because of their specificity and the duration of action they offer from the standpoint of drug delivery. As used in the present invention, the term “liposome” means a vesicle composed of amphiphilic lipids arranged in a spherical bilayer or bilayers.

[0079] Liposomes are unilamellar or multilamellar vesicles which have a membrane formed from a lipophilic material and an aqueous interior. The aqueous portion contains the composition to be delivered. Cationic liposomes possess the advantage of being able to fuse to the cell wall. Non-cationic liposomes, although not able to fuse as efficiently with the cell wall, are taken up by macrophages in vivo.

[0080] In order to cross intact mammalian skin, lipid vesicles must pass through a series of fine pores, each with a diameter less than 50 nm, under the influence of a suitable transdermal gradient. Therefore, it is desirable to use a liposome which is highly deformable and able to pass through such fine pores.

[0081] Further advantages of liposomes include; liposomes obtained from natural phospholipids are biocompatible and biodegradable; liposomes can incorporate a wide range of water and lipid soluble drugs; liposomes can protect encapsulated drugs in their internal compartments from metabolism and degradation (Rosoff, in Pharmaceutical Dosage Forms, Lieberman, Rieger and Banker (Eds.), 1988, Marcel Dekker, Inc., New York, N.Y., volume 1, p. 245). Important considerations in the preparation of liposome formulations are the lipid surface charge, vesicle size and the aqueous volume of the liposomes.

[0082] Liposomes are useful for the transfer and delivery of active ingredients to the site of action. Because the liposomal membrane is structurally similar to biological membranes, when liposomes are applied to a tissue, the liposomes start to merge with the cellular membranes. As the merging of the liposome and cell progresses, the liposomal contents are emptied into the cell where the active agent may act.

[0083] Liposomal formulations have been the focus of extensive investigation as the mode of delivery for many drugs. There is growing evidence that for topical administration, liposomes present several advantages over other formulations. Such advantages include reduced side-effects related to high systemic absorption of the administered drug, increased accumulation of the administered drug at the desired target, and the ability to administer a wide variety of drugs, both hydrophilic and hydrophobic, into the skin.

[0084] Several reports have detailed the ability of liposomes to deliver agents including high-molecular weight DNA into the skin. Compounds including analgesics, antibodies, hormones and high-molecular weight DNAs have been administered to the skin. The majority of applications resulted in the targeting of the upper epidermis.

[0085] Liposomes fall into two broad classes. Cationic liposomes are positively charged liposomes which interact with the negatively charged DNA molecules to form a stable complex. The positively charged DNA/liposome complex binds to the negatively charged cell surface and is internalized in an endosome. Due to the acidic pH within the endosome, the liposomes are ruptured, releasing their contents into the cell cytoplasm (Wang et al., Biochem. Biophys. Res. Commun., 1987, 147, 980-985).

[0086] Liposomes which are pH-sensitive or negatively-charged, entrap DNA rather than complex with it. Since both the DNA and the lipid are similarly charged, repulsion rather than complex formation occurs. Nevertheless, some DNA is entrapped within the aqueous interior of these liposomes. pH-sensitive liposomes have been used to deliver DNA encoding the thymidine kinase gene to cell monolayers in culture. Expression of the exogenous gene was detected in the target cells (Zhou et al., Journal of Controlled Release, 1992, 19, 269-274).

[0087] One major type of liposomal composition includes phospholipids other than naturally-derived phosphatidylcholine. Neutral liposome compositions, for example, can be formed from dimyristoyl phosphatidylcholine (DMPC) or dipalmitoyl phosphatidylcholine (DPPC). Anionic liposome compositions generally are formed from dimyristoyl phosphatidylglycerol, while anionic fusogenic liposomes are formed primarily from dioleoyl phosphatidylethanolamine (DOPE). Another type of liposomal composition is formed from phosphatidylcholine (PC) such as, for example, soybean PC, and egg PC. Another type is formed from mixtures of phospholipid and/or phosphatidylcholine and/or cholesterol.

[0088] Several studies have assessed the topical delivery of liposomal drug formulations to the skin. Application of liposomes containing interferon to guinea pig skin resulted in a reduction of skin herpes sores while delivery of interferon via other means (e.g. as a solution or as an emulsion) were ineffective (Weiner et al., Journal of Drug Targeting, 1992, 2, 405-410). Further, an additional study tested the efficacy of interferon administered as part of a liposomal formulation to the administration of interferon using an aqueous system, and concluded that the liposomal formulation was superior to aqueous administration (du Plessis et al., Antiviral Research, 1992, 18, 259-265).

[0089] Non-ionic liposomal systems have also been examined to determine their utility in the delivery of drugs to the skin, in particular systems comprising non-ionic surfactant and cholesterol. Non-ionic liposomal formulations comprising Novasome™ I (glyceryl dilaurate/cholesterol/polyoxyethylene-10-stearyl ether) and Novasome™ II (glyceryl distearate/cholesterol/polyoxyethylene-10-stearyl ether) were used to deliver cyclosporin-A into the dermis of mouse skin. Results indicated that such non-ionic liposomal systems were effective in facilitating the deposition of cyclosporin-A into different layers of the skin (Hu et al. S.T.P.Pharma. Sci., 1994, 4, 6, 466).

[0090] Liposomes also include “sterically stabilized” liposomes, a term which, as used herein, refers to liposomes comprising one or more specialized lipids that, when incorporated into liposomes, result in enhanced circulation lifetimes relative to liposomes lacking such specialized lipids. Examples of sterically stabilized liposomes are those in which part of the vesicle-forming lipid portion of the liposome (A) comprises one or more glycolipids, such as monosialoganglioside GM_(M1), or (B) is derivatized with one or more hydrophilic polymers, such as a polyethylene glycol (PEG) moiety. While not wishing to be bound by any particular theory, it is thought in the art that, at least for sterically stabilized liposomes containing gangliosides, sphingomyelin, or PEG-derivatized lipids, the enhanced circulation half-life of these sterically stabilized liposomes derives from a reduced uptake into cells of the reticuloendothelial system (RES) (Allen et al., FEBS Letters, 1987, 223, 42; Wu et al., Cancer Research, 1993, 53, 3765).

[0091] Various liposomes comprising one or more glycolipids are known in the art. Papahadjopoulos et al. (Ann. N.Y. Acad. Sci., 1987, 507, 64) reported the ability of monosialoganglioside G_(M1), galactocerebroside sulfate and phosphatidylinositol to improve blood half-lives of liposomes. These findings were expounded upon by Gabizon et al. (Proc. Natl. Acad. Sci. U.S.A., 1988, 85, 6949). U.S. Pat. No. 4,837,028 and WO 88/04924, both to Allen et al., disclose liposomes comprising (1) sphingomyelin and (2) the ganglioside G_(M1) or a galactocerebroside sulfate ester. U.S. Pat. No. 5,543,152 (Webb et al.) discloses liposomes comprising sphingomyelin. Liposomes comprising 1,2-sn-dimyristoylphosphatidylcholine are disclosed in WO 97/13499 (Lim et al.).

[0092] Many liposomes comprising lipids derivatized with one or more hydrophilic polymers, and methods of preparation thereof, are known in the art. Sunamoto et al. (Bull. Chem. Soc. Jpn., 1980, 53, 2778) described liposomes comprising a nonionic detergent, 2C₁₂15G, that contains a PEG moiety. Illum et al. (FEBS Lett., 1984, 167, 79) noted that hydrophilic coating of polystyrene particles with polymeric glycols results in significantly enhanced blood half-lives. Synthetic phospholipids modified by the attachment of carboxylic groups of polyalkylene glycols (e.g., PEG) are described by Sears (U.S. Pat. Nos. 4,426,330 and 4,534,899). Klibanov et al. (FEBS Lett., 1990, 268, 235) described experiments demonstrating that liposomes comprising phosphatidylethanolamine (PE) derivatized with PEG or PEG stearate have significant increases in blood circulation half-lives. Blume et al. (Biochimica et Biophysica Acta, 1990, 1029, 91) extended such observations to other PEG-derivatized phospholipids, e.g., DSPE-PEG, formed from the combination of distearoylphosphatidylethanolamine (DSPE) and PEG. Liposomes having covalently bound PEG moieties on their external surface are described in European Patent No. EP 0 445 131 B1 and WO 90/04384 to Fisher. Liposome compositions containing 1-20 mole percent of PE derivatized with PEG, and methods of use thereof, are described by Woodle et al. (U.S. Pat. Nos. 5,013,556 and 5,356,633) and Martin et al. (U.S. Pat. No. 5,213,804 and European Patent No. EP 0 496 813 B1). Liposomes comprising a number of other lipid-polymer conjugates are disclosed in WO 91/05545 and U.S. Pat. No. 5,225,212 (both to Martin et al.) and in WO 94/20073 (Zalipsky et al.) Liposomes comprising PEG-modified ceramide lipids are described in WO 96/10391 (Choi et al.). U.S. Pat. No. 5,540,935 (Miyazaki et al.) and U.S. Pat. No. 5,556,948 (Tagawa et al.) describe PEG-containing liposomes that can be further derivatized with functional moieties on their surfaces.

[0093] A limited number of liposomes comprising nucleic acids are known in the art. WO 96/40062 to Thierry et al. discloses methods for encapsulating high molecular weight nucleic acids in liposomes. U.S. Pat. No. 5,264,221 to Tagawa et al. discloses protein-bonded liposomes and asserts that the contents of such liposomes may include an antisense RNA. U.S. Pat. No. 5,665,710 to Rahman et al. describes certain methods of encapsulating oligodeoxynucleotides in liposomes. WO 97/04787 to Love et al. discloses liposomes comprising antisense oligonucleotides targeted to the raf gene.

[0094] Transfersomes are yet another type of liposomes, and are highly deformable lipid aggregates which are attractive candidates for drug delivery vehicles. Transfersomes may be described as lipid droplets which are so highly deformable that they are easily able to penetrate through pores which are smaller than the droplet. Transfersomes are adaptable to the environment in which they are used, e.g. they are self-optimizing (adaptive to the shape of pores in the skin), self-repairing, frequently reach their targets without fragmenting, and often self-loading. To make transfersomes it is possible to add surface edge-activators, usually surfactants, to a standard liposomal composition. Transfersomes have been used to deliver serum albumin to the skin. The transfersome-mediated delivery of serum albumin has been shown to be as effective as subcutaneous injection of a solution containing serum albumin.

[0095] Surfactants find wide application in formulations such as emulsions (including microemulsions) and liposomes. The most common way of classifying and ranking the properties of the many different types of surfactants, both natural and synthetic, is by the use of the hydrophile/lipophile balance (HLB). The nature of the hydrophilic group (also known as the “head”) provides the most useful means for categorizing the different surfactants used in formulations (Rieger, in Pharmaceutical Dosage Forms, Marcel Dekker, Inc., New York, N.Y., 1988, p. 285).

[0096] If the surfactant molecule is not ionized, it is classified as a nonionic surfactant. Nonionic surfactants find wide application in pharmaceutical and cosmetic products and are usable over a wide range of pH values. In general their HLB values range from 2 to about 18 depending on their structure. Nonionic surfactants include nonionic esters such as ethylene glycol esters, propylene glycol esters, glyceryl esters, polyglyceryl esters, sorbitan esters, sucrose esters, and ethoxylated esters. Nonionic alkanolamides and ethers such as fatty alcohol ethoxylates, propoxylated alcohols, and ethoxylated/propoxylated block polymers are also included in this class. The polyoxyethylene surfactants are the most popular members of the nonionic surfactant class.

[0097] If the surfactant molecule carries a negative charge when it is dissolved or dispersed in water, the surfactant is classified as anionic. Anionic surfactants include carboxylates such as soaps, acyl lactylates, acyl amides of amino acids, esters of sulfuric acid such as alkyl sulfates and ethoxylated alkyl sulfates, sulfonates such as alkyl benzene sulfonates, acyl isethionates, acyl taurates and sulfosuccinates, and phosphates. The most important members of the anionic surfactant class are the alkyl sulfates and the soaps.

[0098] If the surfactant molecule carries a positive charge when it is dissolved or dispersed in water, the surfactant is classified as cationic. Cationic surfactants include quaternary ammonium salts and ethoxylated amines. The quaternary ammonium salts are the most used members of this class.

[0099] If the surfactant molecule has the ability to carry either a positive or negative charge, the surfactant is classified as amphoteric. Amphoteric surfactants include acrylic acid derivatives, substituted alkylamides, N-alkylbetaines and phosphatides.

[0100] The use of surfactants in drug products, formulations and in emulsions has been reviewed (Rieger, in Pharmaceutical Dosage Forms, Marcel Dekker, Inc., New York, N.Y., 1988, p. 285).

[0101] Penetration Enhancers

[0102] In one embodiment, the present invention employs various penetration enhancers to effect the efficient delivery of nucleic acids, particularly oligonucleotides, to the skin of animals. Most drugs are present in solution in both ionized and nonionized forms. However, usually only lipid soluble or lipophilic drugs readily cross cell membranes. It has been discovered that even non-lipophilic drugs may cross cell membranes if the membrane to be crossed is treated with a penetration enhancer. In addition to aiding the diffusion of non-lipophilic drugs across cell membranes, penetration enhancers also enhance the permeability of lipophilic drugs.

[0103] Penetration enhancers may be classified as belonging to one of five broad categories, i.e., surfactants, fatty acids, bile salts, chelating agents, and non-chelating non-surfactants (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p.92). Each of the above mentioned classes of penetration enhancers are described below in greater detail.

[0104] Surfactants: In connection with the present invention, surfactants (or “surface-active agents”) are chemical entities which, when dissolved in an aqueous solution, reduce the surface tension of the solution or the interfacial tension between the aqueous solution and another liquid, with the result that absorption of oligonucleotides through the mucosa is enhanced. In addition to bile salts and fatty acids, these penetration enhancers include, for example, sodium lauryl sulfate, polyoxyethylene-9-lauryl ether and polyoxyethylene-20-cetyl ether) (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p.92); and perfluorochemical emulsions, such as FC-43. Takahashi et al., J. Pharm. Pharmacol., 1988, 40, 252).

[0105] Fatty acids: Various fatty acids and their derivatives which act as penetration enhancers include, for example, oleic acid, lauric acid, capric acid (n-decanoic acid), myristic acid, palmitic acid, stearic acid, linoleic acid, linolenic acid, dicaprate, tricaprate, monoolein (1-monooleoyl-rac-glycerol), dilaurin, caprylic acid, arachidonic acid, glycerol 1-monocaprate, 1-dodecylazacycloheptan-2-one, acylcarnitines, acylcholines, C₁₋₁₀ alkyl esters thereof (e.g., methyl, isopropyl and t-butyl), and mono- and di-glycerides thereof (i.e., oleate, laurate, caprate, myristate, palmitate, stearate, linoleate, etc.) (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, p.92; Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33; El Hariri et al., J. Pharm. Pharmacol., 1992, 44, 651-654).

[0106] Bile salts: The physiological role of bile includes the facilitation of dispersion and absorption of lipids and fat-soluble vitamins (Brunton, Chapter 38 in: Goodman & Gilman's The Pharmacological Basis of Therapeutics, 9th Ed., Hardman et al. Eds., McGraw-Hill, New York, 1996, pp. 934-935). Various natural bile salts, and their synthetic derivatives, act as penetration enhancers. Thus the term “bile salts” includes any of the naturally occurring components of bile as well as any of their synthetic derivatives. The bile salts of the invention include, for example, cholic acid (or its pharmaceutically acceptable sodium salt, sodium cholate), dehydrocholic acid (sodium dehydrocholate), deoxycholic acid (sodium deoxycholate), glucholic acid (sodium glucholate), glycholic acid (sodium glycocholate), glycodeoxycholic acid (sodium glycodeoxycholate), taurocholic acid (sodium taurocholate), taurodeoxycholic acid (sodium taurodeoxycholate), chenodeoxycholic acid (sodium chenodeoxycholate), ursodeoxycholic acid (UDCA), sodium tauro-24,25-dihydro-fusidate (STDHF), sodium glycodihydrofusidate and polyoxyethylene-9-lauryl ether (POE) (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page 92; Swinyard, Chapter 39 In: Remington's Pharmaceutical Sciences, 18th Ed., Gennaro, ed., Mack Publishing Co., Easton, Pa., 1990, pages 782-783; Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33; Yamamoto et al., J. Pharm. Exp. Ther., 1992, 263, 25; Yamashita et al., J. Pharm. Sci., 1990, 79, 579-583).

[0107] Chelating Agents: Chelating agents, as used in connection with the present invention, can be defined as compounds that remove metallic ions from solution by forming complexes therewith, with the result that absorption of oligonucleotides through the mucosa is enhanced. With regards to their use as penetration enhancers in the present invention, chelating agents have the added advantage of also serving as DNase inhibitors, as most characterized DNA nucleases require a divalent metal ion for catalysis and are thus inhibited by chelating agents (Jarrett, J. Chromatogr., 1993, 618, 315-339). Chelating agents of the invention include but are not limited to disodium ethylenediaminetetraacetate (EDTA), citric acid, salicylates (e.g., sodium salicylate, 5-methoxysalicylate and homovanilate), N-acyl derivatives of collagen, laureth-9 and N-amino acyl derivatives of beta-diketones (enamines)(Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page 92; Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33; Buur et al., J. Control Rel., 1990, 14, 43-51).

[0108] Non-chelating non-surfactants: As used herein, non-chelating non-surfactant penetration enhancing compounds can be defined as compounds that demonstrate insignificant activity as chelating agents or as surfactants but that nonetheless enhance absorption of oligonucleotides through the alimentary mucosa (Muranishi, Critical Reviews in Therapeutic Drug Carrier Systems, 1990, 7, 1-33). This class of penetration enhancers include, for example, unsaturated cyclic ureas, 1-alkyl- and 1-alkenylazacyclo-alkanone derivatives (Lee et al., Critical Reviews in Therapeutic Drug Carrier Systems, 1991, page 92); and non-steroidal anti-inflammatory agents such as diclofenac sodium, indomethacin and phenylbutazone (Yamashita et al., J. Pharm. Pharmacol., 1987, 39, 621-626).

[0109] Agents that enhance uptake of oligonucleotides at the cellular level may also be added to the pharmaceutical and other compositions of the present invention. For example, cationic lipids, such as lipofectin (Junichi et al, U.S. Pat. No. 5,705,188), cationic glycerol derivatives, and polycationic molecules, such as polylysine (Lollo et al., PCT Application WO 97/30731), are also known to enhance the cellular uptake of oligonucleotides.

[0110] Other agents may be utilized to enhance the penetration of the administered nucleic acids, including glycols such as ethylene glycol and propylene glycol, pyrrols such as 2-pyrrol, azones, and terpenes such as limonene and menthone.

[0111] Carriers

[0112] Certain compositions of the present invention also incorporate carrier compounds in the formulation. As used herein, “carrier compound” or “carrier” can refer to a nucleic acid, or analog thereof, which is inert (i.e., does not possess biological activity per se) but is recognized as a nucleic acid by in vivo processes that reduce the bioavailability of a nucleic acid having biological activity by, for example, degrading the biologically active nucleic acid or promoting its removal from circulation. The coadministration of a nucleic acid and a carrier compound, typically with an excess of the latter substance, can result in a substantial reduction of the amount of nucleic acid recovered in the liver, kidney or other extracirculatory reservoirs, presumably due to competition between the carrier compound and the nucleic acid for a common receptor. For example, the recovery of a partially phosphorothioate oligonucleotide in hepatic tissue can be reduced when it is coadministered with polyinosinic acid, dextran sulfate, polycytidic acid or 4-acetamido-4′isothiocyano-stilbene-2,2′-disulfonic acid (Miyao et al., Antisense Res. Dev., 1995, 5, 115-121; Takakura et al., Antisense & Nucl. Acid Drug Dev., 1996, 6, 177-183).

[0113] Excipients

[0114] In contrast to a carrier compound, a “pharmaceutical carrier” or “excipient” is a pharmaceutically acceptable solvent, suspending agent or any other pharmacologically inert vehicle for delivering one or more nucleic acids to an animal. The excipient may be liquid or solid and is selected, with the planned manner of administration in mind, so as to provide for the desired bulk, consistency, etc., when combined with a nucleic acid and the other components of a given pharmaceutical composition. Typical pharmaceutical carriers include, but are not limited to, binding agents (e.g., pregelatinized maize starch, polyvinylpyrrolidone or hydroxypropyl methylcellulose, etc.); fillers (e.g., lactose and other sugars, microcrystalline cellulose, pectin, gelatin, calcium sulfate, ethyl cellulose, polyacrylates or calcium hydrogen phosphate, etc.); lubricants (e.g., magnesium stearate, talc, silica, colloidal silicon dioxide, stearic acid, metallic stearates, hydrogenated vegetable oils, corn starch, polyethylene glycols, sodium benzoate, sodium acetate, etc.); disintegrants (e.g., starch, sodium starch glycolate, etc.); and wetting agents (e.g., sodium lauryl sulphate, etc.).

[0115] Pharmaceutically acceptable organic or inorganic excipient suitable for non-parenteral administration which do not deleteriously react with nucleic acids can also be used to formulate the compositions of the present invention. Suitable pharmaceutically acceptable carriers include, but are not limited to, water, salt solutions, alcohols, polyethylene glycols, gelatin, lactose, amylose, magnesium stearate, talc, silicic acid, viscous paraffin, hydroxymethylcellulose, polyvinylpyrrolidone and the like.

[0116] Formulations for topical administration of nucleic acids may include sterile and non-sterile aqueous solutions, non-aqueous solutions in common solvents such as alcohols, or solutions of the nucleic acids in liquid or solid oil bases. The solutions may also contain buffers, diluents and other suitable additives. Pharmaceutically acceptable organic or inorganic excipients suitable for non-parenteral administration which do not deleteriously react with nucleic acids can be used.

[0117] Suitable pharmaceutically acceptable excipients include, but are not limited to, water, salt solutions, alcohol, polyethylene glycols, gelatin, lactose, amylose, magnesium stearate, talc, silicic acid, viscous paraffin, hydroxymethylcellulose, polyvinylpyrrolidone and the like.

[0118] Other Components

[0119] The compositions of the present invention may additionally contain other adjunct components conventionally found in pharmaceutical compositions, at their art-established usage levels. Thus, for example, the compositions may contain additional, compatible, pharmaceutically-active materials such as, for example, antipruritics, astringents, local anesthetics or anti-inflammatory agents, or may contain additional materials useful in physically formulating various dosage forms of the compositions of the present invention, such as dyes, flavoring agents, preservatives, antioxidants, opacifiers, thickening agents and stabilizers. However, such materials, when added, should not unduly interfere with the biological activities of the components of the compositions of the present invention. The formulations can be sterilized and, if desired, mixed with auxiliary agents, e.g., lubricants, preservatives, stabilizers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, colorings, flavorings and/or aromatic substances and the like which do not deleteriously interact with the nucleic acid(s) of the formulation.

[0120] Aqueous suspensions may contain substances which increase the viscosity of the suspension including, for example, sodium carboxymethylcellulose, sorbitol and/or dextran. The suspension may also contain stabilizers.

[0121] Certain embodiments of the invention provide pharmaceutical compositions containing (a) one or more antisense compounds and (b) one or more other chemotherapeutic agents which function by a non-antisense mechanism. Examples of such chemotherapeutic agents include but are not limited to daunorubicin, daunomycin, dactinomycin, doxorubicin, epirubicin, idarubicin, esorubicin, bleomycin, mafosfamide, ifosfamide, cytosine arabinoside, bis-chloroethylnitrosurea, busulfan, mitomycin C, actinomycin D, mithramycin, prednisone, hydroxyprogesterone, testosterone, tamoxifen, dacarbazine, procarbazine, hexamethylmelamine, pentamethylmelamine, mitoxantrone, amsacrine, chlorambucil, methylcyclohexylnitrosurea, nitrogen mustards, melphalan, cyclophosphamide, 6-mercaptopurine, 6-thioguanine, cytarabine, 5-azacytidine, hydroxyurea, deoxycoformycin, 4-hydroxyperoxycyclophosphoramide, 5-fluorouracil (5-FU), 5-fluorodeoxyuridine (5-FUdR), methotrexate (MTX), colchicine, taxol, vincristine, vinblastine, etoposide (VP-16), trimetrexate, irinotecan, topotecan, gemcitabine, teniposide, cisplatin and diethylstilbestrol (DES). See, generally, The Merck Manual of Diagnosis and Therapy, 15th Ed. 1987, pp. 1206-1228, Berkow et al., eds., Rahway, N.J. When used with the compounds of the invention, such chemotherapeutic agents may be used individually (e.g., 5-FU and oligonucleotide), sequentially (e.g., 5-FU and oligonucleotide for a period of time followed by MTX and oligonucleotide), or in combination with one or more other such chemotherapeutic agents (e.g., 5-FU, MTX and oligonucleotide, or 5-FU, radiotherapy and oligonucleotide). Anti-inflammatory drugs, including but not limited to nonsteroidal anti-inflammatory drugs and corticosteroids, and antiviral drugs, including but not limited to ribivirin, vidarabine, acyclovir and ganciclovir, may also be combined in compositions of the invention. See, generally, The Merck Manual of Diagnosis and Therapy, 15th Ed., Berkow et al., eds., 1987, Rahway, N.J., pages 2499-2506 and 46-49, respectively). Other non-antisense chemotherapeutic agents are also within the scope of this invention. Two or more combined compounds may be used together or sequentially.

[0122] In another related embodiment, compositions of the invention may contain one or more antisense compounds, particularly oligonucleotides, targeted to a first nucleic acid and one or more additional antisense compounds targeted to a second nucleic acid target. Numerous examples of antisense compounds are known in the art. Two or more combined compounds may be used together or sequentially.

[0123] The formulation of therapeutic compositions and their subsequent administration is believed to be within the skill of those in the art. Dosing is dependent on severity and responsiveness of the disease state to be treated, with the course of treatment lasting from several days to several months, or until a cure is effected or a diminution of the disease state is achieved. Optimal dosing schedules can be calculated from measurements of drug accumulation in the body of the patient. Persons of ordinary skill can easily determine optimum dosages, dosing methodologies and repetition rates. Optimum dosages may vary depending on the relative potency of individual oligonucleotides, and can generally be estimated based on EC₅₀s found to be effective in in vitro and in vivo animal models. In general, dosage is from 0.01 ug to 100 g per kg of body weight, and may be given once or more daily, weekly, monthly or yearly, or even once every 2 to 20 years. Persons of ordinary skill in the art can easily estimate repetition rates for dosing based on measured residence times and concentrations of the drug in bodily fluids or tissues. Following successful treatment, it may be desirable to have the patient undergo maintenance therapy to prevent the recurrence of the disease state, wherein the oligonucleotide is administered in maintenance doses, ranging from 0.01 ug to 100 g per kg of body weight, once or more daily, to once every 20 years.

[0124] While the present invention has been described with specificity in accordance with certain of its preferred embodiments, the following examples serve only to illustrate the invention and are not intended to limit the same.

EXAMPLES Example 1 Nucleoside Phosphoramidites for Oligonucleotide Synthesis Deoxy and 2′-alkoxy Amidites

[0125] 2′-Deoxy and 2′-methoxy beta-cyanoethyldiisopropyl phosphoramidites were purchased from commercial sources (e.g. Chemgenes, Needham Mass. or Glen Research, Inc. Sterling Va.). Other 2′-O-alkoxy substituted nucleoside amidites are prepared as described in U.S. Pat. No. 5,506,351, herein incorporated by reference. For oligonucleotides synthesized using 2′-alkoxy amidites, the standard cycle for unmodified oligonucleotides was utilized, except the wait step after pulse delivery of tetrazole and base was increased to 360 seconds.

[0126] Oligonucleotides containing 5-methyl-2′-deoxycytidine (5-Me-C) nucleotides were synthesized according to published methods [Sanghvi, et. al., Nucleic Acids Research, 1993, 21, 3197-3203] using commercially available phosphoramidites (Glen Research, Sterling Va. or ChemGenes, Needham Mass.).

2′-Fluoro Amidites 2′-Fluorodeoxyadenosine Amidites

[0127] 2′-fluoro oligonucleotides were synthesized as described previously [Kawasaki, et. al., J. Med. Chem., 1993, 36, 831-841] and U.S. Pat. No. 5,670,633, herein incorporated by reference. Briefly, the protected nucleoside N6-benzoyl-2′-deoxy-2′-fluoroadenosine was synthesized utilizing commercially available 9-beta-D-arabinofuranosyladenine as starting material and by modifying literature procedures whereby the 2′-alpha-fluoro atom is introduced by a S_(N)2-displacement of a 2′-beta-trityl group. Thus N6-benzoyl-9-beta-D-arabinofuranosyladenine was selectively protected in moderate yield as the 3′,5′-ditetrahydropyranyl (THP) intermediate. Deprotection of the THP and N6-benzoyl groups was accomplished using standard methodologies and standard methods were used to obtain the 5′-dimethoxytrityl-(DMT) and 5′-DMT-3′-phosphoramidite intermediates.

2′-Fluorodeoxyguanosine

[0128] The synthesis of 2′-deoxy-2′-fluoroguanosine was accomplished using tetraisopropyldisiloxanyl (TPDS) protected 9-beta-D-arabinofuranosylguanine as starting material, and conversion to the intermediate diisobutyryl-arabinofuranosylguanosine. Deprotection of the TPDS group was followed by protection of the hydroxyl group with THP to give diisobutyryl di-THP protected arabinofuranosylguanine. Selective O-deacylation and triflation was followed by treatment of the crude product with fluoride, then deprotection of the THP groups. Standard methodologies were used to obtain the 5′-DMT- and 5′-DMT-3′-phosphoramidites.

2′-Fluorouridine

[0129] Synthesis of 2′-deoxy-2′-fluorouridine was accomplished by the modification of a literature procedure in which 2,2′-anhydro-1-beta-D-arabinofuranosyluracil was treated with 70% hydrogen fluoride-pyridine. Standard procedures were used to obtain the 5′-DMT and 5′-DMT-3′phosphoramidites.

2′-Fluorodeoxycytidine

[0130] 2′-deoxy-2′-fluorocytidine was synthesized via amination of 2′-deoxy-2′-fluorouridine, followed by selective protection to give N4-benzoyl-2′-deoxy-2′-fluorocytidine. Standard procedures were used to obtain the 5′-DMT and 5′-DMT-3′phosphoramidites.

2′-O-(2-Methoxyethyl) Modified Amidites

[0131] 2′-O-Methoxyethyl-substituted nucleoside amidites are prepared as follows, or alternatively, as per the methods of Martin, P., Helvetica Chimica Acta, 1995, 78, 486-504.

2,2′-Anhydro[1-(beta-D-arabinofuranosyl)-5-methyluridine]

[0132] 5-Methyluridine (ribosylthymine, commercially available through Yamasa, Choshi, Japan) (72.0 g, 0.279 M), diphenyl-carbonate (90.0 g, 0.420 M) and sodium bicarbonate (2.0 g, 0.024 M) were added to DMF (300 mL). The mixture was heated to reflux, with stirring, allowing the evolved carbon dioxide gas to be released in a controlled manner. After 1 hour, the slightly darkened solution was concentrated under reduced pressure. The resulting syrup was poured into diethylether (2.5 L), with stirring. The product formed a gum. The ether was decanted and the residue was dissolved in a minimum amount of methanol (ca. 400 mL). The solution was poured into fresh ether (2.5 L) to yield a stiff gum. The ether was decanted and the gum was dried in a vacuum oven (60° C. at 1 mm Hg for 24 h) to give a solid that was crushed to a light tan powder (57 g, 85% crude yield). The NMR spectrum was consistent with the structure, contaminated with phenol as its sodium salt (ca. 5%). The material was used as is for further reactions (or it can be purified further by column chromatography using a gradient of methanol in ethyl acetate (10-25%) to give a white solid, mp 222-4° C.).

2′-O-Methoxyethyl-5-methyluridine

[0133] 2,2′-Anhydro-5-methyluridine (195 g, 0.81 M), tris(2-methoxyethyl)borate (231 g, 0.98 M) and 2-methoxyethanol (1.2 L) were added to a 2 L stainless steel pressure vessel and placed in a pre-heated oil bath at 160° C. After heating for 48 hours at 155-160° C., the vessel was opened and the solution evaporated to dryness and triturated with MeOH (200 mL). The residue was suspended in hot acetone (1 L). The insoluble salts were filtered, washed with acetone (150 mL) and the filtrate evaporated. The residue (280 g) was dissolved in CH₃CN (600 mL) and evaporated. A silica gel column (3 kg) was packed in CH₂Cl₂/acetone/MeOH (20:5:3) containing 0.5% Et₃NH. The residue was dissolved in CH₂Cl₂ (250 mL) and adsorbed onto silica (150 g) prior to loading onto the column. The product was eluted with the packing solvent to give 160 g (63%) of product. Additional material was obtained by reworking impure fractions.

2′-O-Methoxyethyl-5′-O-dimethoxytrityl-5-methyluridine

[0134] 2′-O-Methoxyethyl-5-methyluridine (160 g, 0.506 M) was co-evaporated with pyridine (250 mL) and the dried residue dissolved in pyridine (1.3 L). A first aliquot of dimethoxytrityl chloride (94.3 g, 0.278 M) was added and the mixture stirred at room temperature for one hour. A second aliquot of dimethoxytrityl chloride (94.3 g, 0.278 M) was added and the reaction stirred for an additional one hour. Methanol (170 mL) was then added to stop the reaction. HPLC showed the presence of approximately 70% product. The solvent was evaporated and triturated with CH₃CN (200 mL). The residue was dissolved in CHCl₃ (1.5 L) and extracted with 2×500 mL of saturated NaHCO₃ and 2×500 mL of saturated NaCl. The organic phase was dried over Na₂SO₄, filtered and evaporated. 275 g of residue was obtained. The residue was purified on a 3.5 kg silica gel column, packed and eluted with EtOAc/hexane/acetone (5:5:1) containing 0.5% Et₃NH. The pure fractions were evaporated to give 164 g of product. Approximately 20 g additional was obtained from the impure fractions to give a total yield of 183 g (57%).

3′-O-Acetyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methyluridine

[0135] 2′-O-Methoxyethyl-5′-O-dimethoxytrityl-5-methyluridine (106 g, 0.167 M), DMF/pyridine (750 mL of a 3:1 mixture prepared from 562 mL of DMF and 188 mL of pyridine) and acetic anhydride (24.38 mL, 0.258 M) were combined and stirred at room temperature for 24 hours. The reaction was monitored by TLC by first quenching the TLC sample with the addition of MeOH. Upon completion of the reaction, as judged by TLC, MeOH (50 mL) was added and the mixture evaporated at 35° C. The residue was dissolved in CHCl₃ (800 mL) and extracted with 2×200 mL of saturated sodium bicarbonate and 2×200 mL of saturated NaCl. The water layers were back extracted with 200 mL of CHCl₃. The combined organics were dried with sodium sulfate and evaporated to give 122 g of residue (approx. 90% product). The residue was purified on a 3.5 kg silica gel column and eluted using EtOAc/hexane(4:1). Pure product fractions were evaporated to yield 96 g (84%). An additional 1.5 g was recovered from later fractions.

3′-O-Acetyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methyl-4-triazoleuridine

[0136] A first solution was prepared by dissolving 3′-O-acetyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methyluridine (96 g, 0.144 M) in CH₃CN (700 mL) and set aside. Triethylamine (189 mL, 1.44 M) was added to a solution of triazole (90 g, 1.3 M) in CH₃CN (1 L), cooled to −5° C. and stirred for 0.5 h using an overhead stirrer. POCl₃ was added dropwise, over a 30 minute period, to the stirred solution maintained at 0-10° C., and the resulting mixture stirred for an additional 2 hours. The first solution was added dropwise, over a 45 minute period, to the latter solution. The resulting reaction mixture was stored overnight in a cold room. Salts were filtered from the reaction mixture and the solution was evaporated. The residue was dissolved in EtOAc (1 L) and the insoluble solids were removed by filtration. The filtrate was washed with 1×300 mL of NaHCO₃ and 2×300 mL of saturated NaCl, dried over sodium sulfate and evaporated. The residue was triturated with EtOAc to give the title compound.

2′-O-Methoxyethyl-5′-O-dimethoxytrityl-5-methylcytidine

[0137] A solution of 3′-O-acetyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methyl-4-triazoleuridine (103 g, 0.141 M) in dioxane (500 mL) and NH₄OH (30 mL) was stirred at room temperature for 2 hours. The dioxane solution was evaporated and the residue azeotroped with MeOH (2×200 mL). The residue was dissolved in MeOH (300 mL) and transferred to a 2 liter stainless steel pressure vessel. MeOH (400 mL) saturated with NH₃ gas was added and the vessel heated to 100° C. for 2 hours (TLC showed complete conversion). The vessel contents were evaporated to dryness and the residue was dissolved in EtOAc (500 mL) and washed once with saturated NaCl (200 mL). The organics were dried over sodium sulfate and the solvent was evaporated to give 85 g (95%) of the title compound.

N4-Benzoyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methylcytidine

[0138] 2′-O-Methoxyethyl-5′-O-dimethoxytrityl-5-methylcytidine (85 g, 0.134 M) was dissolved in DMF (800 mL) and benzoic anhydride (37.2 g, 0.165 M) was added with stirring. After stirring for 3 hours, TLC showed the reaction to be approximately 95% complete. The solvent was evaporated and the residue azeotroped with MeOH (200 mL). The residue was dissolved in CHCl₃ (700 mL) and extracted with saturated NaHCO₃ (2×300 mL) and saturated NaCl (2×300 mL), dried over MgSO₄ and evaporated to give a residue (96 g). The residue was chromatographed on a 1.5 kg silica column using EtOAc/hexane (1:1) containing 0.5% Et₃NH as the eluting solvent. The pure product fractions were evaporated to give 90 g (90%) of the title compound.

N4-Benzoyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methylcytidine-3′-amidite

[0139] N4-Benzoyl-2′-O-methoxyethyl-5′-O-dimethoxytrityl-5-methylcytidine (74 g, 0.10 M) was dissolved in CH₂Cl₂ (1 L). Tetrazole diisopropylamine (7.1 g) and 2-cyanoethoxy-tetra-(isopropyl)phosphite (40.5 mL, 0.123 M) were added with stirring, under a nitrogen atmosphere. The resulting mixture was stirred for 20 hours at room temperature (TLC showed the reaction to be 95% complete). The reaction mixture was extracted with saturated NaHCO₃ (1×300 mL) and saturated NaCl (3×300 mL). The aqueous washes were back-extracted with CH₂Cl₂ (300 mL), and the extracts were combined, dried over MgSO₄ and concentrated. The residue obtained was chromatographed on a 1.5 kg silica column using EtOAc/hexane (3:1) as the eluting solvent. The pure fractions were combined to give 90.6 g (87%) of the title compound.

2′-O-(Aminooxyethyl) Nucleoside Amidites and 2′-O-(dimethylaminooxyethyl) Nucleoside Amidites 2′-(Dimethylaminooxyethoxy) Nucleoside Amidites

[0140] 2′-(Dimethylaminooxyethoxy) nucleoside amidites [also known in the art as 2′-O-(dimethylaminooxyethyl) nucleoside amidites] are prepared as described in the following paragraphs. Adenosine, cytidine and guanosine nucleoside amidites are prepared similarly to the thymidine (5-methyluridine) except the exocyclic amines are protected with a benzoyl moiety in the case of adenosine and cytidine and with isobutyryl in the case of guanosine.

5′-O-tert-Butyldiphenylsilyl-O²-2′-anhydro-5-methyluridine

[0141] O²-2′-anhydro-5-methyluridine (Pro. Bio. Sint., Varese, Italy, 100.0 g, 0.416 mmol), dimethylaminopyridine (0.66 g, 0.013 eq, 0.0054 mmol) were dissolved in dry pyridine (500 ml) at ambient temperature under an argon atmosphere and with mechanical stirring. tert-Butyldiphenylchlorosilane (125.8 g, 119.0 mL, 1.1 eq, 0.458 mmol) was added in one portion. The reaction was stirred for 16 h at ambient temperature. TLC (Rf 0.22, ethyl acetate) indicated a complete reaction. The solution was concentrated under reduced pressure to a thick oil. This was partitioned between dichloromethane (1 L) and saturated sodium bicarbonate (2×1 L) and brine (1 L). The organic layer was dried over sodium sulfate and concentrated under reduced pressure to a thick oil. The oil was dissolved in a 1:1 mixture of ethyl acetate and ethyl ether (600 mL) and the solution was cooled to −10° C. The resulting crystalline product was collected by filtration, washed with ethyl ether (3×200 mL) and dried (40° C., 1 mm Hg, 24 h) to 149 g (74.8%) of white solid. TLC and NMR were consistent with pure product.

5′-O-tert-Butyldiphenylsilyl-2′-O-(2-hydroxyethyl)-5-methyluridine

[0142] In a 2 L stainless steel, unstirred pressure reactor was added borane in tetrahydrofuran (1.0 M, 2.0 eq, 622 mL). In the fume hood and with manual stirring, ethylene glycol (350 mL, excess) was added cautiously at first until the evolution of hydrogen gas subsided. 5′-O-tert-Butyldiphenylsilyl-O²-2′-anhydro-5-methyluridine (149 g, 0.311 mol) and sodium bicarbonate (0.074 g, 0.003 eq) were added with manual stirring. The reactor was sealed and heated in an oil bath until an internal temperature of 160° C. was reached and then maintained for 16 h (pressure<100 psig). The reaction vessel was cooled to ambient and opened. TLC (Rf 0.67 for desired product and Rf 0.82 for ara-T side product, ethyl acetate) indicated about 70% conversion to the product. In order to avoid additional side product formation, the reaction was stopped, concentrated under reduced pressure (10 to 1 mm Hg) in a warm water bath (40-100° C.) with the more extreme conditions used to remove the ethylene glycol. [Alternatively, once the low boiling solvent is gone, the remaining solution can be partitioned between ethyl acetate and water. The product will be in the organic phase.] The residue was purified by column chromatography (2 kg silica gel, ethyl acetate-hexanes gradient 1:1 to 4:1). The appropriate fractions were combined, stripped and dried to product as a white crisp foam (84 g, 50%), contaminated starting material (17.4 g) and pure reusable starting material 20 g. The yield based on starting material less pure recovered starting material was 58%. TLC and NMR were consistent with 99% pure product.

2′-O-([2-phthalimidoxy)ethyl]-5′-t-butyldiphenylsilyl-5-methyluridine

[0143] 5′-O-tert-Butyldiphenylsilyl-2′-O-(2-hydroxyethyl)-5-methyluridine (20 g, 36.98 mmol) was mixed with triphenylphosphine (1.63 g, 44.36 mmol) and N-hydroxyphthalimide (7.24 g, 44.36 mmol). It was then dried over P₂O₅ under high vacuum for two days at 40° C. The reaction mixture was flushed with argon and dry THF (369.8 mL, Aldrich, sure seal bottle) was added to get a clear solution. Diethyl-azodicarboxylate (6.98 mL, 44.36 mmol) was added dropwise to the reaction mixture. The rate of addition is maintained such that resulting deep red coloration is just discharged before adding the next drop. After the addition was complete, the reaction was stirred for 4 hrs. By that time TLC showed the completion of the reaction (ethylacetate:hexane, 60:40). The solvent was evaporated in vacuum. Residue obtained was placed on a flash column and eluted with ethyl acetate:hexane (60:40), to get 2′-O-([2-phthalimidoxy)ethyl]-5′-t-butyldiphenylsilyl-5-methyluridine as white foam (21.819 g, 86%).

5′-O-tert-butyldiphenylsilyl-2′-O-[(2-formadoximinooxy)ethyl]-5-methyluridine

[0144] 2′-O-([2-phthalimidoxy)ethyl]-5′-t-butyldiphenylsilyl-5-methyluridine (3.1 g, 4.5 mmol) was dissolved in dry CH₂Cl₂ (4.5 mL) and methylhydrazine (300 mL, 4.64 mmol) was added dropwise at −10° C. to 0° C. After 1 h the mixture was filtered, the filtrate was washed with ice cold CH₂Cl₂ and the combined organic phase was washed with water, brine and dried over anhydrous Na₂SO₄. The solution was concentrated to get 2′-O-(aminooxyethyl) thymidine, which was then dissolved in MeOH (67.5 mL). To this formaldehyde (20% aqueous solution, w/w, 1.1 eq.) was added and the resulting mixture was strirred for 1 h. Solvent was removed under vacuum; residue chromatographed to get 5′-O-tert-butyldiphenylsilyl-2′-O-[(2-formadoximinooxy) ethyl]-5-methyluridine as white foam (1.95 g, 78%).

5′-O-tert-Butyldiphenylsilyl-2′-O-[N,N-dimethylaminooxyethyl]-5-methyluridine

[0145] 5′-O-tert-butyldiphenylsilyl-2′-O-[(2-formadoximinooxy)ethyl]-5-methyluridine (1.77 g, 3.12 mmol) was dissolved in a solution of 1M pyridinium p-toluenesulfonate (PPTS) in dry MeOH (30.6 mL). Sodium cyanoborohydride (0.39 g, 6.13 mmol) was added to this solution at 10° C. under inert atmosphere. The reaction mixture was stirred for 10 minutes at 10° C. After that the reaction vessel was removed from the ice bath and stirred at room temperature for 2 h, the reaction monitored by TLC (5% MeOH in CH₂Cl₂). Aqueous NaHCO₃ solution (5%, 10 mL) was added and extracted with ethyl acetate (2×20 mL). Ethyl acetate phase was dried over anhydrous Na₂SO₄, evaporated to dryness. Residue was dissolved in a solution of 1M PPTS in MeOH (30.6 mL). Formaldehyde (20% w/w, 30 mL, 3.37 mmol) was added and the reaction mixture was stirred at room temperature for 10 minutes. Reaction mixture cooled to 10° C. in an ice bath, sodium cyanoborohydride (0.39 g, 6.13 mmol) was added and reaction mixture stirred at 10° C. for 10 minutes. After 10 minutes, the reaction mixture was removed from the ice bath and stirred at room temperature for 2 hrs. To the reaction mixture 5% NaHCO₃ (25 mL) solution was added and extracted with ethyl acetate (2×25 mL). Ethyl acetate layer was dried over anhydrous Na₂SO₄ and evaporated to dryness. The residue obtained was purified by flash column chromatography and eluted with 5% MeOH in CH₂Cl₂ to get 5′-O-tert-butyldiphenylsilyl-2′-O-[N,N-dimethylaminooxyethyl]-5-methyluridine as a white foam (14.6 g, 80%).

2′-O-(dimethylaminooxyethyl)-5-methyluridine

[0146] Triethylamine trihydrofluoride (3.91 mL, 24.0 mmol) was dissolved in dry THF and triethylamine (1.67 mL, 12 mmol, dry, kept over KOH). This mixture of triethylamine-2HF was then added to 5′-O-tert-butyldiphenylsilyl-2′-O-[N,N-dimethylaminooxyethyl]-5-methyluridine (1.40 g, 2.4 mmol) and stirred at room temperature for 24 hrs. Reaction was monitored by TLC (5% MeOH in CH₂Cl₂). Solvent was removed under vacuum and the residue placed on a flash column and eluted with 10% MeOH in CH₂Cl₂ to get 2′-O-(dimethylaminooxyethyl)-5-methyluridine (766 mg, 92.5%).

5′-O-DMT-2′-O-(dimethylaminooxyethyl)-5-methyluridine

[0147] 2′-O-(dimethylaminooxyethyl)-5-methyluridine (750 mg, 2.17 mmol) was dried over P₂O₅ under high vacuum overnight at 40° C. It was then co-evaporated with anhydrous pyridine (20 mL). The residue obtained was dissolved in pyridine (11 mL) under argon atmosphere. 4-dimethylaminopyridine (26.5 mg, 2.60 mmol), 4,4′-dimethoxytrityl chloride (880 mg, 2.60 mmol) was added to the mixture and the reaction mixture was stirred at room temperature until all of the starting material disappeared. Pyridine was removed under vacuum and the residue chromatographed and eluted with 10% MeOH in CH₂Cl₂ (containing a few drops of pyridine) to get 5′-O-DMT-2′-O-(dimethylamino-oxyethyl)-5-methyluridine (1.13 g, 80%).

5′-O-DMT-2′-O-(2-N,N-dimethylaminooxyethyl)-5-methyluridine-3′-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite]

[0148] 5′-O-DMT-2′-O-(dimethylaminooxyethyl)-5-methyluridine (1.08 g, 1.67 mmol) was co-evaporated with toluene (20 mL). To the residue N,N-diisopropylamine tetrazonide (0.29 g, 1.67 mmol) was added and dried over P₂O₅ under high vacuum overnight at 40° C. Then the reaction mixture was dissolved in anhydrous acetonitrile (8.4 mL) and 2-cyanoethyl-N,N,N¹,N¹-tetraisopropylphosphoramidite (2.12 mL, 6.08 mmol) was added. The reaction mixture was stirred at ambient temperature for 4 hrs under inert atmosphere. The progress of the reaction was monitored by TLC (hexane:ethyl acetate 1:1). The solvent was evaporated, then the residue was dissolved in ethyl acetate (70 mL) and washed with 5% aqueous NaHCO₃ (40 mL). Ethyl acetate layer was dried over anhydrous Na₂SO₄ and concentrated. Residue obtained was chromatographed (ethyl acetate as eluent) to get 5′-O-DMT-2′-O-(2-N,N-dimethylaminooxyethyl)-5-methyluridine-3′-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite] as a foam (1.04 g, 74.9%).

2′-(Aminooxyethoxy) Nucleoside Amidites

[0149] 2′-(Aminooxyethoxy) nucleoside amidites [also known in the art as 2′-O-(aminooxyethyl) nucleoside amidites] are prepared as described in the following paragraphs. Adenosine, cytidine and thymidine nucleoside amidites are prepared similarly.

N2-isobutyryl-6-O-diphenylcarbamoyl-2′-O-(2-ethylacetyl)-5′-O-(4,4′-dimethoxytrityl)guanosine-3′-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite]

[0150] The 2′-O-aminooxyethyl guanosine analog may be obtained by selective 2′-O-alkylation of diaminopurine riboside. Multigram quantities of diaminopurine riboside may be purchased from Schering AG (Berlin) to provide 2′-O-(2-ethylacetyl) diaminopurine riboside along with a minor amount of the 3′-O-isomer. 2′-O-(2-ethylacetyl) diaminopurine riboside may be resolved and converted to 2′-O-(2-ethylacetyl)guanosine by treatment with adenosine deaminase. (McGee, D. P. C., Cook, P. D., Guinosso, C. J., WO 94/02501 A1 940203.) Standard protection procedures should afford 2′-O-(2-ethylacetyl)-5′-O-(4,4′-dimethoxytrityl)guanosine and 2-N-isobutyryl-6-O-diphenylcarbamoyl-2′-O-(2-ethylacetyl)-5′-O-(4,4′-dimethoxytrityl)guanosine which may be reduced to provide 2-N-isobutyryl-6-O-diphenylcarbamoyl-2′-O-(2-hydroxyethyl)-5′-O-(4,4′-dimethoxytrityl)guanosine. As before the hydroxyl group may be displaced by N-hydroxyphthalimide via a Mitsunobu reaction, and the protected nucleoside may phosphitylated as usual to yield 2-N-isobutyryl-6-O-diphenylcarbamoyl-2′-O-([2-phthalmidoxy]ethyl)-5′-O-(4,4′-dimethoxytrityl)guanosine-3′-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite].

2′-dimethylaminoethoxyethoxy (2′-DMAEOE) Nucleoside Amidites

[0151] 2′-dimethylaminoethoxyethoxy nucleoside amidites (also known in the art as 2′-O-dimethylaminoethoxyethyl, i.e., 2′-O—CH₂—O—CH₂—N(CH₂)₂, or 2′-DMAEOE nucleoside amidites) are prepared as follows. Other nucleoside amidites are prepared similarly.

2′-O-[2(2-N,N-dimethylaminoethoxy)ethyl]-5-methyl Uridine

[0152] 2[2-(Dimethylamino)ethoxy]ethanol (Aldrich, 6.66 g, 50 mmol) is slowly added to a solution of borane in tetrahydrofuran (1 M, 10 mL, 10 mmol) with stirring in a 100 mL bomb. Hydrogen gas evolves as the solid dissolves. O²-, 2′-anhydro-5-methyluridine (1.2 g, 5 mmol), and sodium bicarbonate (2.5 mg) are added and the bomb is sealed, placed in an oil bath and heated to 155° C. for 26 hours. The bomb is cooled to room temperature and opened. The crude solution is concentrated and the residue partitioned between water (200 mL) and hexanes (200 mL). The excess phenol is extracted into the hexane layer. The aqueous layer is extracted with ethyl acetate (3×200 mL) and the combined organic layers are washed once with water, dried over anhydrous sodium sulfate and concentrated. The residue is columned on silica gel using methanol/methylene chloride 1:20 (which has 2% triethylamine) as the eluent. As the column fractions are concentrated a colorless solid forms which is collected to give the title compound as a white solid.

5′-O-dimethoxytrityl-2′-O-[2(2-N,N-dimethylaminoethoxy) ethyl)]-5-methyl Uridine

[0153] To 0.5 g (1.3 mmol) of 2′-O-[2(2-N,N-dimethylaminoethoxy)ethyl)]-5-methyl uridine in anhydrous pyridine (8 mL), triethylamine (0.36 mL) and dimethoxytrityl chloride (DMT-Cl, 0.87 g, 2 eq.) are added and stirred for 1 hour. The reaction mixture is poured into water (200 mL) and extracted with CH₂Cl₂ (2×200 mL). The combined CH₂Cl₂ layers are washed with saturated NaHCO₃ solution, followed by saturated NaCl solution and dried over anhydrous sodium sulfate. Evaporation of the solvent followed by silica gel chromatography using MeOH:CH₂Cl₂:Et₃N (20:1, v/v, with 1% triethylamine) gives the title compound.

5′-O-Dimethoxytrityl-2′-O-[2(2-N,N-dimethylaminoethoxy)-ethyl)]-5-methyl Uridine-3′-O-(cyanoethyl-N,N-diisopropyl)phosphoramidite

[0154] Diisopropylaminotetrazolide (0.6 g) and 2-cyanoethoxy-N,N-diisopropyl phosphoramidite (1.1 mL, 2 eq.) are added to a solution of 5′-O-dimethoxytrityl-2′-O-[2(2-N,N-dimethylaminoethoxy)ethyl)]-5-methyluridine (2.17 g, 3 mmol) dissolved in CH₂Cl₂ (20 mL) under an atmosphere of argon. The reaction mixture is stirred overnight and the solvent evaporated. The resulting residue is purified by silica gel flash column chromatography with ethyl acetate as the eluent to give the title compound.

Example 2

[0155] Oligonucleotide Synthesis

[0156] Unsubstituted and substituted phosphodiester (P=O) oligonucleotides are synthesized on an automated DNA synthesizer (Applied Biosystems model 380B) using standard phosphoramidite chemistry with oxidation by iodine.

[0157] Phosphorothioates (P=S) are synthesized as for the phosphodiester oligonucleotides except the standard oxidation bottle was replaced by 0.2 M solution of 3H-1,2-benzodithiole-3-one 1,1-dioxide in acetonitrile for the stepwise thiation of the phosphite linkages. The thiation wait step was increased to 68 sec and was followed by the capping step. After cleavage from the CPG column and deblocking in concentrated ammonium hydroxide at 55° C. (18 h), the oligonucleotides were purified by precipitating twice with 2.5 volumes of ethanol from a 0.5 M NaCl solution.

[0158] Phosphinate oligonucleotides are prepared as described in U.S. Pat. No. 5,508,270, herein incorporated by reference.

[0159] Alkyl phosphonate oligonucleotides are prepared as described in U.S. Pat. No. 4,469,863, herein incorporated by reference.

[0160] 3′-Deoxy-3′-methylene phosphonate oligonucleotides are prepared as described in U.S. Pat. Nos. 5,610,289 or 5,625,050, herein incorporated by reference.

[0161] Phosphoramidite oligonucleotides are prepared as described in U.S. Pat. No. 5,256,775 or 5,366,878, herein incorporated by reference.

[0162] Alkylphosphonothioate oligonucleotides are prepared as described in published PCT applications PCT/US94/00902 and PCT/US93/06976 (published as WO 94/17093 and WO 94/02499, respectively), herein incorporated by reference.

[0163] 3′-Deoxy-3′-amino phosphoramidate oligonucleotides are prepared as described in U.S. Pat. No. 5,476,925, herein incorporated by reference.

[0164] Phosphotriester oligonucleotides are prepared as described in U.S. Pat. No. 5,023,243, herein incorporated by reference.

[0165] Borano phosphate oligonucleotides are prepared as described in U.S. Pat. Nos. 5,130,302 and 5,177,198, both herein incorporated by reference.

Example 3

[0166] Oligonucleoside Synthesis

[0167] Methylenemethylimino linked oligonucleosides, also identified as MMI linked oligonucleosides, methylenedimethyl-hydrazo linked oligonucleosides, also identified as MDH linked oligonucleosides, and methylenecarbonylamino linked oligonucleosides, also identified as amide-3 linked oligonucleosides, and methyleneaminocarbonyl linked oligo-nucleosides, also identified as amide-4 linked oligonucleo-sides, as well as mixed backbone compounds having, for instance, alternating MMI and P=O or P=S linkages are prepared as described in U.S. Pat. Nos. 5,378,825, 5,386,023, 5,489,677, 5,602,240 and 5,610,289, all of which are herein incorporated by reference.

[0168] Formacetal and thioformacetal linked oligonucleosides are prepared as described in U.S. Pat. Nos. 5,264,562 and 5,264,564, herein incorporated by reference.

[0169] Ethylene oxide linked oligonucleosides are prepared as described in U.S. Pat. No. 5,223,618, herein incorporated by reference.

Example 4

[0170] PNA Synthesis

[0171] Peptide nucleic acids (PNAs) are prepared in accordance with any of the various procedures referred to in Peptide Nucleic Acids (PNA): Synthesis, Properties and Potential Applications, Bioorganic & Medicinal Chemistry, 1996, 4, 5-23. They may also be prepared in accordance with U.S. Pat. Nos. 5,539,082, 5,700,922, and 5,719,262, herein incorporated by reference.

Example 5

[0172] Synthesis of Chimeric Oligonucleotides

[0173] Chimeric oligonucleotides, oligonucleosides or mixed oligonucleotides/oligonucleosides of the invention can be of several different types. These include a first type wherein the “gap” segment of linked nucleosides is positioned between 5′ and 3′ “wing” segments of linked nucleosides and a second “open end” type wherein the “gap” segment is located at either the 3′ or the 5′ terminus of the oligomeric compound. Oligonucleotides of the first type are also known in the art as “gapmers” or gapped oligonucleotides. oligonucleotides of the second type are also known in the art as “hemimers” or “wingmers”.

[2′-O-Me]--[2′-deoxy]--[2′-O-Me]Chimeric Phosphorothioate Oligonucleotides

[0174] Chimeric oligonucleotides having 2′-O-alkyl phosphorothioate and 2′-deoxy phosphorothioate oligo-nucleotide segments are synthesized using an Applied Biosystems automated DNA synthesizer Model 380B, as above. Oligonucleotides are synthesized using the automated synthesizer and 2′-deoxy-5′-dimethoxytrityl-3′-O-phosphor-amidite for the DNA portion and 5′-dimethoxytrityl-2′-O-methyl-3′-O-phosphoramidite for 5′ and 3′ wings. The standard synthesis cycle is modified by increasing the wait step after the delivery of tetrazole and base to 600 s repeated four times for RNA and twice for 2′-O-methyl. The fully protected oligonucleotide is cleaved from the support and the phosphate group is deprotected in 3:1 ammonia/ethanol at room temperature overnight then lyophilized to dryness. Treatment in methanolic ammonia for 24 hrs at room temperature is then done to deprotect all bases and sample was again lyophilized to dryness. The pellet is resuspended in 1M TBAF in THF for 24 hrs at room temperature to deprotect the 2′ positions. The reaction is then quenched with 1M TEAA and the sample is then reduced to ½volume by rotovac before being desalted on a G25 size exclusion column. The oligo recovered is then analyzed spectrophotometrically for yield and for purity by capillary electrophoresis and by mass spectrometry.

[2′-O-(2-Methoxyethyl)]--[2′-deoxy]--[2′-O-(Methoxyethyl)] Chimeric Phosphorothioate Oligonucleotides

[0175] [2′-O-(2-methoxyethyl)]--[2′-deoxy]--[-2′-O-(methoxy-ethyl)] chimeric phosphorothioate oligonucleotides were prepared as per the procedure above for the 2′-O-methyl chimeric oligonucleotide, with the substitution of 2′-O-(methoxyethyl) amidites for the 2′-O-methyl amidites.

[2′-O-(2-Methoxyethyl)Phosphodiester]--[2′-deoxy Phosphorothioate]--[2′-O-(2-Methoxyethyl) Phosphodiester] Chimeric Oligonucleotides

[0176] [2′-O-(2-methoxyethyl phosphodiester]--[2′-deoxy phosphorothioate]--[2′-O-(methoxyethyl) phosphodiester] chimeric oligonucleotides are prepared as per the above procedure for the 2′-O-methyl chimeric oligonucleotide with the substitution of 2′-O-(methoxyethyl) amidites for the 2′-O-methyl amidites, oxidization with iodine to generate the phosphodiester internucleotide linkages within the wing portions of the chimeric structures and sulfurization utilizing 3,H-1,2 benzodithiole-3-one 1,1 dioxide (Beaucage Reagent) to generate the phosphorothioate internucleotide linkages for the center gap.

[0177] Other chimeric oligonucleotides, chimeric oligonucleo-sides and mixed chimeric oligonucleotides/oligonucleosides are synthesized according to U.S. Pat. No. 5,623,065, herein incorporated by reference.

Example 6

[0178] Oligonucleotide Isolation

[0179] After cleavage from the controlled pore glass column (Applied Biosystems) and deblocking in concentrated ammonium hydroxide at 55° C. for 18 hours, the oligonucleotides or oligonucleosides are purified by precipitation twice out of 0.5 M NaCl with 2.5 volumes ethanol. Synthesized oligonucleotides were analyzed by polyacrylamide gel electrophoresis on denaturing gels and judged to be at least 85% full length material. The relative amounts of phosphorothioate and phosphodiester linkages obtained in synthesis were periodically checked by ³¹P nuclear magnetic resonance spectroscopy, and for some studies oligonucleotides were purified by HPLC, as described by Chiang et al., J. Biol. Chem. 1991, 266, 18162-18171. Results obtained with HPLC-purified material were similar to those obtained with non-HPLC purified material.

Example 7

[0180] Oligonucleotide Synthesis—96 Well Plate Format

[0181] Oligonucleotides were synthesized via solid phase P(III) phosphoramidite chemistry on an automated synthesizer capable of assembling 96 sequences simultaneously in a standard 96 well format. Phosphodiester internucleotide linkages were afforded by oxidation with aqueous iodine. Phosphorothioate internucleotide linkages were generated by sulfurization utilizing 3,H-1,2 benzodithiole-3-one 1,1 dioxide (Beaucage Reagent) in anhydrous acetonitrile. Standard base-protected beta-cyanoethyldiisopropyl phosphoramidites were purchased from commercial vendors (e.g. PE-Applied Biosystems, Foster City, Calif., or Pharmacia, Piscataway, N.J.). Non-standard nucleosides are synthesized as per known literature or patented methods. They are utilized as base protected beta-cyanoethyldiisopropyl phosphoramidites.

[0182] Oligonucleotides were cleaved from support and deprotected with concentrated NH₄OH at elevated temperature (55-60° C.) for 12-16 hours and the released product then dried in vacuo. The dried product was then re-suspended in sterile water to afford a master plate from which all analytical and test plate samples are then diluted utilizing robotic pipettors.

Example 8

[0183] Oligonucleotide Analysis—96 Well Plate Format

[0184] The concentration of oligonucleotide in each well was assessed by dilution of samples and UV absorption spectroscopy. The full-length integrity of the individual products was evaluated by capillary electrophoresis (CE) in either the 96 well format (Beckman P/ACE™ MDQ) or, for individually prepared samples, on a commercial CE apparatus (e.g., Beckman P/ACE™ 5000, ABI 270). Base and backbone composition was confirmed by mass analysis of the compounds utilizing electrospray-mass spectroscopy. All assay test plates were diluted from the master plate using single and multi-channel robotic pipettors. Plates were judged to be acceptable if at least 85% of the compounds on the plate were at least 85% full length.

Example 9

[0185] Cell Culture and Oligonucleotide Treatment

[0186] The effect of antisense compounds on target nucleic acid expression can be tested in any of a variety of cell types provided that the target nucleic acid is present at measurable levels. This can be routinely determined using, for example, PCR or Northern blot analysis. The following 4 cell types are provided for illustrative purposes, but other cell types can be routinely used, provided that the target is expressed in the cell type chosen. This can be readily determined by methods routine in the art, for example Northern blot analysis, Ribonuclease protection assays, or RT-PCR.

[0187] T-24 Cells:

[0188] The human transitional cell bladder carcinoma cell line T-24 was obtained from the American Type Culture Collection (ATCC) (Manassas, Va.). T-24 cells were routinely cultured in complete McCoy's 5A basal media (Gibco/Life Technologies, Gaithersburg, Md.) supplemented with 10% fetal calf serum (Gibco/Life Technologies, Gaithersburg, Md.), penicillin 100 units per mL, and streptomycin 100 micrograms per mL (Gibco/Life Technologies, Gaithersburg, Md.). Cells were routinely passaged by trypsinization and dilution when they reached 90% confluence. Cells were seeded into 96-well plates (Falcon-Primaria #3872) at a density of 7000 cells/well for use in RT-PCR analysis.

[0189] For Northern blotting or other analysis, cells may be seeded onto 100 mm or other standard tissue culture plates and treated similarly, using appropriate volumes of medium and oligonucleotide.

[0190] A549 Cells:

[0191] The human lung carcinoma cell line A549 was obtained from the American Type Culture Collection (ATCC) (Manassas, Va.). A549 cells were routinely cultured in DMEM basal media (Gibco/Life Technologies, Gaithersburg, Md.) supplemented with 10% fetal calf serum (Gibco/Life Technologies, Gaithersburg, Md.), penicillin 100 units per mL, and streptomycin 100 micrograms per mL (Gibco/Life Technologies, Gaithersburg, Md.). Cells were routinely passaged by trypsinization and dilution when they reached 90% confluence.

[0192] NHDF Cells:

[0193] Human neonatal dermal fibroblast (NHDF) were obtained from the Clonetics Corporation (Walkersville Md.). NHDFs were routinely maintained in Fibroblast Growth Medium (Clonetics Corporation, Walkersville Md.) supplemented as recommended by the supplier. Cells were maintained for up to 10 passages as recommended by the supplier.

[0194] HEK Cells:

[0195] Human embryonic keratinocytes (HEK) were obtained from the Clonetics Corporation (Walkersville Md.). HEKs were routinely maintained in Keratinocyte Growth Medium (Clonetics Corporation, Walkersville Md.) formulated as recommended by the supplier. Cells were routinely maintained for up to 10 passages as recommended by the supplier.

[0196] Treatment with Antisense Compounds:

[0197] When cells reached 80% confluency, they were treated with oligonucleotide. For cells grown in 96-well plates, wells were washed once with 200 μL OPTI-MEM™-1 reduced-serum medium (Gibco BRL) and then treated with 130 μL of OPTI-MEM™-1 containing 3.75 μg/mL LIPOFECTIN™ (Gibco BRL) and the desired concentration of oligonucleotide. After 4-7 hours of treatment, the medium was replaced with fresh medium. Cells were harvested 16-24 hours after oligonucleotide treatment.

[0198] The concentration of oligonucleotide used varies from cell line to cell line. To determine the optimal oligonucleotide concentration for a particular cell line, the cells are treated with a positive control oligonucleotide at a range of concentrations. For human cells the positive control oligonucleotide is ISIS 13920, TCCGTCATCGCTCCTCAGGG, SEQ ID NO: 1, a 2′-O-methoxyethyl gapmer (2′-O-methoxyethyls shown in bold) with a phosphorothioate backbone which is targeted to human H-ras. For mouse or rat cells the positive control oligonucleotide is ISIS 15770, ATGCATTCTGCCCCCAAGGA, SEQ ID NO: 2, a 2′-O-methoxyethyl gapmer (2′-O-methoxyethyls shown in bold) with a phosphorothioate backbone which is targeted to both mouse and rat c-raf. The concentration of positive control oligonucleotide that results in 80% inhibition of c-Ha-ras (for ISIS 13920) or c-raf (for ISIS 15770) mRNA is then utilized as the screening concentration for new oligonucleotides in subsequent experiments for that cell line. If 80% inhibition is not achieved, the lowest concentration of positive control oligonucleotide that results in 60% inhibition of H-ras or c-raf mRNA is then utilized as the oligonucleotide screening concentration in subsequent experiments for that cell line. If 60% inhibition is not achieved, that particular cell line is deemed as unsuitable for oligonucleotide transfection experiments.

Example 10

[0199] Analysis of Oligonucleotide Inhibition of RECQL4 Expression

[0200] Antisense modulation of RECQL4 expression can be assayed in a variety of ways known in the art. For example, RECQL4 mRNA levels can be quantitated by, e.g., Northern blot analysis, competitive polymerase chain reaction (PCR), or real-time PCR (RT-PCR). Real-time quantitative PCR is presently preferred. RNA analysis can be performed on total cellular RNA or poly(A)+ mRNA. Methods of RNA isolation are taught in, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 1, pp. 4.1.1-4.2.9 and 4.5.1-4.5.3, John Wiley & Sons, Inc., 1993. Northern blot analysis is routine in the art and is taught in, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 1, pp. 4.2.1-4.2.9, John Wiley & Sons, Inc., 1996. Real-time quantitative (PCR) can be conveniently accomplished using the commercially available ABI PRISM™ 7700 Sequence Detection System, available from PE-Applied Biosystems, Foster City, Calif. and used according to manufacturer's instructions.

[0201] Protein levels of RECQL4 can be quantitated in a variety of ways well known in the art, such as immunoprecipitation, Western blot analysis (immunoblotting), ELISA or fluorescence-activated cell sorting (FACS). Antibodies directed to RECQL4 can be identified and obtained from a variety of sources, such as the MSRS catalog of antibodies (Aerie Corporation, Birmingham, Mich.), or can be prepared via conventional antibody generation methods. Methods for preparation of polyclonal antisera are taught in, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 2, pp. 11.12.1-11.12.9, John Wiley & Sons, Inc., 1997. Preparation of monoclonal antibodies is taught in, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 2, pp. 11.4.1-11.11.5, John Wiley & Sons, Inc., 1997.

[0202] Immunoprecipitation methods are standard in the art and can be found at, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 2, pp. 10.16.1-10.16.11, John Wiley & Sons, Inc., 1998. Western blot (immunoblot) analysis is standard in the art and can be found at, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 2, pp. 10.8.1-10.8.21, John Wiley & Sons, Inc., 1997. Enzyme-linked immunosorbent assays (ELISA) are standard in the art and can be found at, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 2, pp. 11.2.1-11.2.22, John Wiley & Sons, Inc., 1991.

Example 11

[0203] Poly(A)+ mRNA Isolation

[0204] Poly(A)+ mRNA was isolated according to Miura et al., Clin. Chem., 1996, 42, 1758-1764. Other methods for poly(A)+ mRNA isolation are taught in, for example, Ausubel, F. M. et al., Current Protocols in Molecular Biology, Volume 1, pp. 4.5.1-4.5.3, John Wiley & Sons, Inc., 1993. Briefly, for cells grown on 96-well plates, growth medium was removed from the cells and each well was washed with 200 μL cold PBS. 60 μL lysis buffer (10 mM Tris-HCl, pH 7.6, 1 mM EDTA, 0.5 M NaCl, 0.5% NP-40, 20 mM vanadyl-ribonucleoside complex) was added to each well, the plate was gently agitated and then incubated at room temperature for five minutes. 55 μL of lysate was transferred to Oligo d(T) coated 96-well plates (AGCT Inc., Irvine Calif.). Plates were incubated for 60 minutes at room temperature, washed 3 times with 200 μL of wash buffer (10 mM Tris-HCl pH 7.6, 1 mM EDTA, 0.3 M NaCl). After the final wash, the plate was blotted on paper towels to remove excess wash buffer and then air-dried for 5 minutes. 60 μL of elution buffer (5 mM Tris-HCl pH 7.6), preheated to 70° C. was added to each well, the plate was incubated on a 90° C. hot plate for 5 minutes, and the eluate was then transferred to a fresh 96-well plate.

[0205] Cells grown on 100 mm or other standard plates may be treated similarly, using appropriate volumes of all solutions.

Example 12

[0206] Total RNA Isolation

[0207] Total RNA was isolated using an RNEASY 96™ kit and buffers purchased from Qiagen Inc. (Valencia Calif.) following the manufacturer's recommended procedures. Briefly, for cells grown on 96-well plates, growth medium was removed from the cells and each well was washed with 200 μL cold PBS. 100 μL Buffer RLT was added to each well and the plate vigorously agitated for 20 seconds. 100 μL of 70% ethanol was then added to each well and the contents mixed by pipetting three times up and down. The samples were then transferred to the RNEASY 96™ well plate attached to a QIAVAC™ manifold fitted with a waste collection tray and attached to a vacuum source. Vacuum was applied for 15 seconds. 1 mL of Buffer RW1 was added to each well of the RNEASY ₉₆™ plate and the vacuum again applied for 15 seconds. 1 mL of Buffer RPE was then added to each well of the RNEASY 96™ plate and the vacuum applied for a period of 15 seconds. The Buffer RPE wash was then repeated and the vacuum was applied for an additional 10 minutes. The plate was then removed from the QIAVAC™ manifold and blotted dry on paper towels. The plate was then re-attached to the QIAVAC™ manifold fitted with a collection tube rack containing 1.2 mL collection tubes. RNA was then eluted by pipetting 60 μL water into each well, incubating 1 minute, and then applying the vacuum for 30 seconds. The elution step was repeated with an additional 60 μL water.

[0208] The repetitive pipetting and elution steps may be automated using a QIAGEN Bio-Robot 9604 (Qiagen, Inc., Valencia Calif.). Essentially, after lysing of the cells on the culture plate, the plate is transferred to the robot deck where the pipetting, DNase treatment and elution steps are carried out.

Example 13

[0209] Real-time Quantitative PCR Analysis of RECQL4 mRNA Levels

[0210] Quantitation of RECQL4 mRNA levels was determined by real-time quantitative PCR using the ABI PRISM™ 7700 Sequence Detection System (PE-Applied Biosystems, Foster City, Calif.) according to manufacturer's instructions. This is a closed-tube, non-gel-based, fluorescence detection system which allows high-throughput quantitation of polymerase chain reaction (PCR) products in real-time. As opposed to standard PCR, in which amplification products are quantitated after the PCR is completed, products in real-time quantitative PCR are quantitated as they accumulate. This is accomplished by including in the PCR reaction an oligonucleotide probe that anneals specifically between the forward and reverse PCR primers, and contains two fluorescent dyes. A reporter dye (e.g., JOE, FAM, or VIC, obtained from either Operon Technologies Inc., Alameda, Calif. or PE-Applied Biosystems, Foster City, Calif.) is attached to the 5′ end of the probe and a quencher dye (e.g., TAMRA, obtained from either Operon Technologies Inc., Alameda, Calif. or PE-Applied Biosystems, Foster City, Calif.) is attached to the 3′ end of the probe. When the probe and dyes are intact, reporter dye emission is quenched by the proximity of the 3′ quencher dye. During amplification, annealing of the probe to the target sequence creates a substrate that can be cleaved by the 5′-exonuclease activity of Taq polymerase. During the extension phase of the PCR amplification cycle, cleavage of the probe by Taq polymerase releases the reporter dye from the remainder of the probe (and hence from the quencher moiety) and a sequence-specific fluorescent signal is generated. With each cycle, additional reporter dye molecules are cleaved from their respective probes, and the fluorescence intensity is monitored at regular intervals by laser optics built into the ABI PRISM™ 7700 Sequence Detection System. In each assay, a series of parallel reactions containing serial dilutions of mRNA from untreated control samples generates a standard curve that is used to quantitate the percent inhibition after antisense oligonucleotide treatment of test samples.

[0211] Prior to quantitative PCR analysis, primer-probe sets specific to the target gene being measured are evaluated for their ability to be “multiplexed” with a GAPDH amplification reaction. In multiplexing, both the target gene and the internal standard gene GAPDH are amplified concurrently in a single sample. In this analysis, mRNA isolated from untreated cells is serially diluted. Each dilution is amplified in the presence of primer-probe sets specific for GAPDH only, target gene only (“single-plexing”), or both (multiplexing). Following PCR amplification, standard curves of GAPDH and target mRNA signal as a function of dilution are generated from both the single-plexed and multiplexed samples. If both the slope and correlation coefficient of the GAPDH and target signals generated from the multiplexed samples fall within 10% of their corresponding values generated from the single-plexed samples, the primer-probe set specific for that target is deemed multiplexable. Other methods of PCR are also known in the art.

[0212] PCR reagents were obtained from PE-Applied Biosystems, Foster City, Calif. RT-PCR reactions were carried out by adding 25 μL PCR cocktail (1× TAQMAN™ buffer A, 5.5 mM MgCl₂, 300 μM each of DATP, dCTP and dGTP, 600 μM of dUTP, 100 nM each of forward primer, reverse primer, and probe, 20 Units RNAse inhibitor, 1.25 Units AMPLITAQ GOLD™, and 12.5 Units MuLV reverse transcriptase) to 96 well plates containing 25 μL total RNA solution. The RT reaction was carried out by incubation for 30 minutes at 48° C. Following a 10 minute incubation at 95° C. to activate the AMPLITAQ GOLD™, 40 cycles of a two-step PCR protocol were carried out: 95° C. for 15 seconds (denaturation) followed by 60° C. for 1.5 minutes (annealing/extension).

[0213] Gene target quantities obtained by real time RT-PCR are normalized using either the expression level of GAPDH, a gene whose expression is constant, or by quantifying total RNA using RiboGreen™ (Molecular Probes, Inc. Eugene, Oreg.). GAPDH expression is quantified by real time RT-PCR, by being run simultaneously with the target, multiplexing, or separately. Total RNA is quantified using RiboGreen™ RNA quantification reagent from Molecular Probes. Methods of RNA quantification by RiboGreen™ are taught in Jones, L. J., et al, Analytical Biochemistry, 1998, 265, 368-374.

[0214] In this assay, 175 μL of RiboGreen™ working reagent (RiboGreen™ reagent diluted 1:2865 in 10 mM Tris-HCl, 1 mM EDTA, pH 7.5) is pipetted into a 96-well plate containing 25 uL purified, cellular RNA. The plate is read in a CytoFluor 4000 (PE Applied Biosystems) with excitation at 480 nm and emission at 520 nm.

[0215] Probes and primers to human RECQL4 were designed to hybridize to a human RECQL4 sequence, using published sequence information (GenBank accession number NM_(—)004260, incorporated herein as SEQ ID NO:3). For human RECQL4 the PCR primers were:

[0216] forward primer: TCTCCCCTGCTGTCACTCATG (SEQ ID NO: 4)

[0217] reverse primer: CCCGTTGCTTCCTGGTCA (SEQ ID NO: 5) and the PCR

[0218] probe was: FAM-TCAAGGCGGCCTGCATACACTCG-TAMRA (SEQ ID NO: 6) where FAM (PE-Applied Biosystems, Foster City, Calif.) is the fluorescent reporter dye) and TAMRA (PE-Applied Biosystems, Foster City, Calif.) is the quencher dye. For human GAPDH the PCR primers were:

[0219] forward primer: GAAGGTGAAGGTCGGAGTC (SEQ ID NO: 7)

[0220] reverse primer: GAAGATGGTGATGGGATTTC (SEQ ID NO: 8) and the

[0221] PCR probe was: 5′ JOE-CAAGCTTCCCGTTCTCAGCCX- TAMRA 3′ (SEQ ID NO: 9) where JOE (PE-Applied Biosystems, Foster City, Calif.) is the fluorescent reporter dye) and TAMRA (PE-Applied Biosystems, Foster City, Calif.) is the quencher dye.

Example 14

[0222] Northern Blot Analysis of RECQL4 mRNA Levels

[0223] Eighteen hours after antisense treatment, cell monolayers were washed twice with cold PBS and lysed in 1 mL RNAZOL™ (TEL-TEST “B” Inc., Friendswood, Tex.). Total RNA was prepared following manufacturer's recommended protocols. Twenty micrograms of total RNA was fractionated by electrophoresis through 1.2% agarose gels containing 1.1% formaldehyde using a MOPS buffer system (AMRESCO, Inc. Solon, Ohio). RNA was transferred from the gel to HYBOND™-N+ nylon membranes (Amersham Pharmacia Biotech, Piscataway, N.J.) by overnight capillary transfer using a Northern/Southern Transfer buffer system (TEL-TEST “B” Inc., Friendswood, Tex.). RNA transfer was confirmed by UV visualization. Membranes were fixed by UV cross-linking using a STRATALINKER™ UV Crosslinker 2400 (Stratagene, Inc, La Jolla, Calif.) and then robed using QUICKHYB™ hybridization solution (Stratagene, La Jolla, Calif.) using manufacturer's recommendations for stringent conditions.

[0224] To detect human RECQL4, a human RECQL4 specific probe was prepared by PCR using the forward primer TCTCCCCTGCTGTCACTCATG (SEQ ID NO: 4) and the reverse primer CCCGTTGCTTCCTGGTCA (SEQ ID NO: 5). To normalize for variations in loading and transfer efficiency membranes were stripped and probed for human glyceraldehyde-3-phosphate dehydrogenase (GAPDH) RNA (Clontech, Palo Alto, Calif.).

[0225] Hybridized membranes were visualized and quantitated using a PHOSPHORIMAGER™ and IMAGEQUANT™ Software V3.3 (Molecular Dynamics, Sunnyvale, Calif.). Data was normalized to GAPDH levels in untreated controls.

Example 15

[0226] Antisense Inhibition of Human RECQL4 Expression by Chimeric Phosphorothioate Oligonucleotides Having 2′-MOE Wings and a Deoxy Gap

[0227] In accordance with the present invention, a series of oligonucleotides were designed to target different regions of the human RECQL4 RNA, using published sequences (GenBank accession number NM_(—)004260 representing the mRNA sequence of RECQL4, incorporated herein as SEQ ID NO: 3, GenBank accession number AB026546 representing the genomic sequence of the RECQL4 gene, incorporated herein as SEQ ID NO: 10, and GenBank accession number AL042193 which extends the 3′UTR region of NM_(—)004260, incorporated herein as SEQ ID NO: 11). The oligonucleotides are shown in Table 1. “Target site” indicates the first (5′-most) nucleotide number on the particular target sequence to which the oligonucleotide binds. All compounds in Table 1 are chimeric oligonucleotides (“gapmers”) 20 nucleotides in length, composed of a central “gap” region consisting of ten 2′-deoxynucleotides, which is flanked on both sides (5′ and 3′ directions) by five-nucleotide “wings”. The wings are composed of 2′-methoxyethyl (2′-MOE)nucleotides. The internucleoside (backbone) linkages are phosphorothioate (P=S) throughout the oligonucleotide. All cytidine residues are 5-methylcytidines. The compounds were analyzed for their effect on human RECQL4 mRNA levels by quantitative real-time PCR as described in other examples herein. Data are averages from two experiments. If present, “N.D.” indicates “no data”. TABLE 1 Inhibition of human RECQL4 mRNA levels by chimeric phosphorothioate oligonucleotides having 2′-MOE wings and a deoxy gap TARGET SEQ ID TARGET SEQ ID ISIS # REGION NO SITE SEQUENCE % INHIB NO 137102 3′UTR 11 54 tctgacaaccccagctctac 83 12 137103 3′UTR 11 70 agtcactgccctagcctctg 97 13 137104 3′UTR 11 85 tttgcccaggtcctcagtca 87 14 137105 3′UTR 11 120 ttggagcctcctcgttccca 91 15 137106 Coding 3 345 ctggtccggcctgcagggtg 89 16 137107 Coding 3 364 cacggtctgcggcccagggc 90 17 137108 Coding 3 378 ctcttcctagaggccacggt 94 18 137109 Coding 3 467 gagctgtggaggctcatcac 86 19 137110 Coding 3 498 ggagccggcctggccttggc 88 20 137111 Coding 3 576 ggacctcactgtgacatcgc 77 21 137112 Intron 4 10 580 ggagcgaggcccggcccttc 93 22 137113 Coding 3 590 ccccagaaaatctgggacct 86 23 137114 Coding 3 756 ctccactgctgctgggctgg 86 24 137115 Coding 3 786 agggctcctcgttccatctc 90 25 137116 Coding 3 1044 gtacgtaattgcccctgtca 74 26 137117 Intron 5 10 1055 aactcaggcccctgagctac 52 27 137118 Coding 3 1103 gaggagcctgctacggagtg 69 28 137119 Coding 3 1110 gcttgcggaggagcctgcta 66 29 137120 Coding 3 1119 tccatgcctgcttgcggagg 89 30 137121 Coding 3 1122 gcttccatgcctgcttgcgg 91 31 137122 Coding 3 1129 cacttctgcttccatgcctg 94 32 137123 Coding 3 1223 ggctgcccagtgatcgaact 81 33 137124 Coding 3 1269 gcccaacagcatctgtgtct 90 34 137125 Coding 3 1475 cgtggagatgccagacagga 47 35 137126 Coding 3 1571 gacgaccaacgtgaggcagg 97 36 137127 Coding 3 1612 aggccagacacctggtcatc 83 37 137128 Coding 3 1626 tgagacacggtggcaggcca 95 38 137129 Coding 3 1655 ggtcatgcccgagtgtatgc 98 39 137130 Coding 3 1696 gctgcccgaatcttctgcag 84 40 137131 Coding 3 1737 ccaccagtgcctcaggtgtc 81 41 137132 Coding 3 1814 ggagaggcagtgggcctcat 74 42 137133 Coding 3 1869 cccgaagcaccttgcagacg 95 43 137134 Coding 3 1889 gcagtgcacgcccatgcgct 91 44 137135 Coding 3 1939 gccacgtcactggcagtgcg 94 45 137136 Coding 3 1958 agccacagccaggtgctgtg 65 46 137137 Coding 3 2019 tggacacggaaaggtgcagg 84 47 137138 Coding 3 2050 gtcaacagtgcctggtctgt 88 48 137139 Intron: 10 2108 ccctccagggcagatgtctc 92 49 Exon Junction 137140 Coding 3 2109 gccggttgcagtaaatgata 71 50 137141 Intron 7 10 2191 gggtacctggaaggcctgtt 87 51 137142 Coding 3 2214 ggtaggcctcggctgtggtt 83 52 137143 Coding 3 2224 atgcccgcgtggtaggcctc 81 53 137144 Coding 3 2278 cgcaactggccctgcatgaa 85 54 137145 Coding 3 2307 tcccaaaggccaccgtggcc 83 55 137146 Coding 3 2387 cacggcctgcacgtagctct 89 56 137147 Coding 3 2418 gggcaggctgcccgtcacgc 87 57 137148 Coding 3 2478 gcacatgtctgcgcagctct 79 58 137149 Coding 3 2522 ctgtaccagcctcttcacag 91 59 137150 Coding 3 2545 caggtgcaggctgggaacac 72 60 137151 Coding 3 2557 ctggtgcaggtgcaggtgca 62 61 137152 Coding 3 2675 catgcagacccttctgggtc 65 62 137153 Coding 3 2692 agtgcccgctcatggcccat 91 63 137154 Coding 3 2703 gctgtattgggagtgcccgc 95 64 137155 Coding 3 2722 tccaaagcctgtacggtaag 90 65 137156 Coding 3 2746 gtctcgatggcctcctccgg 44 66 137157 Coding 3 2772 ggtgcagctccaggtagcac 93 67 137158 Coding 3 2795 cagcagctccagccagtggt 61 68 137159 Coding 3 2949 ccatgtcaaactccacggag 81 69 137160 Coding 3 2964 agtccaccagcttgaccatg 96 70 137161 Coding 3 2980 agctcccagcccatggagtc 85 71 137162 Coding 3 3020 gtcccactgcagctggcaga 64 72 137163 Coding 3 3046 cgccgcacacctgtcctggg 90 73 137164 Coding 3 3091 aggtggaaggccagctcact 68 74 137165 Coding 3 3117 cagcggtcaggtcccccggg 81 75 137166 Coding 3 3139 tcacatatctggtccttctc 71 76 137167 Coding 3 3163 gcctgcacacggccatagag 93 77 137168 Coding 3 3227 gaaggctacgctgtgaaagg 81 78 137169 Coding 3 3385 caatcctggagtctggcctg 72 79 137170 Coding 3 3390 cctcocaatcctggagtctg 82 80 137171 Coding 3 3425 ggacaggaactggcggatgt 87 81 137172 Coding 3 3464 ggccacagccctgctggaga 62 82 137173 Coding 3 3473 gaagatgcgggccacagccc 70 83 137174 Stop 3 3607 cagcgggccacctgcaggag 86 84 Codon 137175 Exon 11 10 3673 catatggctcaccttgcaga 29 85 137176 Intron 10 3971 gcagtcagcagccagggccc 71 86 13 137177 Intron 10 4214 tgtgcccaaggtgggtccac 49 87 14 137178 Intron 10 4248 aagacaggcagatggtcagt 79 88 14 137179 Intron 10 5176 cacctgtgcccagggaaaaa 33 89 17

[0228] As shown in Table 1, SEQ ID NOs 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86 and 88 demonstrated at least 60% inhibition of human RECQL4 expression in this assay and are therefore preferred. The target sites to which these preferred sequences are complementary are herein referred to as “active sites” and are therefore preferred sites for targeting by compounds of the present invention.

Example 16

[0229] Western Blot Analysis of RECQL4 Protein Levels

[0230] Western blot analysis (immunoblot analysis) is carried out using standard methods. Cells are harvested 16-20 h after oligonucleotide treatment, washed once with PBS, suspended in Laemmli buffer (100 ul/well), boiled for 5 minutes and loaded on a 16% SDS-PAGE gel. Gels are run for 1.5 hours at 150 V, and transferred to membrane for western blotting. Appropriate primary antibody directed to RECQL4 is used, with a radiolabelled or fluorescently labeled secondary antibody directed against the primary antibody species. Bands are visualized using a PHOSPHORIMAGER™ (Molecular Dynamics, Sunnyvale Calif.).

1 89 1 20 DNA Artificial Sequence Antisense Oligonucleotide 1 tccgtcatcg ctcctcaggg 20 2 20 DNA Artificial Sequence Antisense Oligonucleotide 2 atgcattctg cccccaagga 20 3 3627 DNA Homo sapiens CDS (1)...(3627) 3 atg gag cgg ctg cgg gac gtg cgg gag cgg ctg cag gcg tgg gag cgc 48 Met Glu Arg Leu Arg Asp Val Arg Glu Arg Leu Gln Ala Trp Glu Arg 1 5 10 15 gcg ttc cga cgg cag cgc ggg cgg cga ccg agc cag gac gac gtg gag 96 Ala Phe Arg Arg Gln Arg Gly Arg Arg Pro Ser Gln Asp Asp Val Glu 20 25 30 gcg gcg ccg gag gag acc cgc gcg ctc tac cgg gag tac cgc act ctg 144 Ala Ala Pro Glu Glu Thr Arg Ala Leu Tyr Arg Glu Tyr Arg Thr Leu 35 40 45 aag cgt acc acg ggc cag gcc ggc ggc ggg ctc cgc agc tcc gag tcg 192 Lys Arg Thr Thr Gly Gln Ala Gly Gly Gly Leu Arg Ser Ser Glu Ser 50 55 60 ctc ccc gcg gcg gcc gaa gag gcg cca gag ccc cgc tgc tgg ggg ccc 240 Leu Pro Ala Ala Ala Glu Glu Ala Pro Glu Pro Arg Cys Trp Gly Pro 65 70 75 80 cat ctg aat cgg gct gcg acc aag agt cca cag cct acg cca ggg cgg 288 His Leu Asn Arg Ala Ala Thr Lys Ser Pro Gln Pro Thr Pro Gly Arg 85 90 95 agc cgc cag ggc tcg gtg ccg gac tac ggg cag cgg ctc aag gcc aat 336 Ser Arg Gln Gly Ser Val Pro Asp Tyr Gly Gln Arg Leu Lys Ala Asn 100 105 110 ctg aaa ggc acc ctg cag gcc gga cca gcc ctg ggc cgc aga ccg tgg 384 Leu Lys Gly Thr Leu Gln Ala Gly Pro Ala Leu Gly Arg Arg Pro Trp 115 120 125 cct cta gga aga gcc tca tct aag gca tcc acc cca aag ccc cca ggt 432 Pro Leu Gly Arg Ala Ser Ser Lys Ala Ser Thr Pro Lys Pro Pro Gly 130 135 140 aca ggg cct gtc ccc tcc ttt gca gaa aaa gtc agt gat gag cct cca 480 Thr Gly Pro Val Pro Ser Phe Ala Glu Lys Val Ser Asp Glu Pro Pro 145 150 155 160 cag ctc cct gag ccc cag cca agg cca ggc cgg ctc cag cat ctg cag 528 Gln Leu Pro Glu Pro Gln Pro Arg Pro Gly Arg Leu Gln His Leu Gln 165 170 175 gca tcc ctg agc cag cgg ctg ggc tcc cta gat cct ggc tgg tta cag 576 Ala Ser Leu Ser Gln Arg Leu Gly Ser Leu Asp Pro Gly Trp Leu Gln 180 185 190 cga tgt cac agt gag gtc cca gat ttt ctg ggg gcc ccc aaa gcc tgc 624 Arg Cys His Ser Glu Val Pro Asp Phe Leu Gly Ala Pro Lys Ala Cys 195 200 205 agg cct gat cta ggc tca gag gaa tca caa ctt ctg atc cct ggt gag 672 Arg Pro Asp Leu Gly Ser Glu Glu Ser Gln Leu Leu Ile Pro Gly Glu 210 215 220 tcg gct gtc ctt ggt cct ggt gct ggc tcc cag ggc cca gag gct tca 720 Ser Ala Val Leu Gly Pro Gly Ala Gly Ser Gln Gly Pro Glu Ala Ser 225 230 235 240 gcc ttc caa gaa gtc agc atc cgt gtg ggg agc ccc cag ccc agc agc 768 Ala Phe Gln Glu Val Ser Ile Arg Val Gly Ser Pro Gln Pro Ser Ser 245 250 255 agt gga ggc gag aag cgg aga tgg aac gag gag ccc tgg gag agc ccc 816 Ser Gly Gly Glu Lys Arg Arg Trp Asn Glu Glu Pro Trp Glu Ser Pro 260 265 270 gca cag gtc cag cag gag agc agc caa gct gga ccc cca tcg gag ggg 864 Ala Gln Val Gln Gln Glu Ser Ser Gln Ala Gly Pro Pro Ser Glu Gly 275 280 285 gct ggg gct gta gca gtt gag gaa gac cct cca ggg gaa cct gta cag 912 Ala Gly Ala Val Ala Val Glu Glu Asp Pro Pro Gly Glu Pro Val Gln 290 295 300 gca cag cca cct cag ccc tgc agc agc cca tcg aac ccc agg tac cac 960 Ala Gln Pro Pro Gln Pro Cys Ser Ser Pro Ser Asn Pro Arg Tyr His 305 310 315 320 gga ctc agc ccc tcc agt caa gct agg gct ggg aag gct gag ggc aca 1008 Gly Leu Ser Pro Ser Ser Gln Ala Arg Ala Gly Lys Ala Glu Gly Thr 325 330 335 gcc ccc ctg cac atc ttc cct cgg ctg gcc cgc cat gac agg ggc aat 1056 Ala Pro Leu His Ile Phe Pro Arg Leu Ala Arg His Asp Arg Gly Asn 340 345 350 tac gta cgg ctc aac atg aag cag aaa cac tac gtg cgg ggc cgg gca 1104 Tyr Val Arg Leu Asn Met Lys Gln Lys His Tyr Val Arg Gly Arg Ala 355 360 365 ctc cgt agc agg ctc ctc cgc aag cag gca tgg aag cag aag tgg cgg 1152 Leu Arg Ser Arg Leu Leu Arg Lys Gln Ala Trp Lys Gln Lys Trp Arg 370 375 380 aag aaa ggg gag tgt ttt ggg ggt ggt ggt gcc aca gtc aca acc aag 1200 Lys Lys Gly Glu Cys Phe Gly Gly Gly Gly Ala Thr Val Thr Thr Lys 385 390 395 400 gag tct tgt ttc ctg aac gag cag ttc gat cac tgg gca gcc cag tgt 1248 Glu Ser Cys Phe Leu Asn Glu Gln Phe Asp His Trp Ala Ala Gln Cys 405 410 415 ccc cgg cca gca agt gag gaa gac aca gat gct gtt ggg cct gag cca 1296 Pro Arg Pro Ala Ser Glu Glu Asp Thr Asp Ala Val Gly Pro Glu Pro 420 425 430 ctg gtt cct tca cca caa cct gta cct gag gtg ccc agc ctg gac ccc 1344 Leu Val Pro Ser Pro Gln Pro Val Pro Glu Val Pro Ser Leu Asp Pro 435 440 445 acc gtg ctg cca ctc tac tcc ctg ggg ccc tca ggg cag ttg gca gag 1392 Thr Val Leu Pro Leu Tyr Ser Leu Gly Pro Ser Gly Gln Leu Ala Glu 450 455 460 acg ccg gct gag gtg ttc cag gcc ctg gag cag ctg ggg cac caa gcc 1440 Thr Pro Ala Glu Val Phe Gln Ala Leu Glu Gln Leu Gly His Gln Ala 465 470 475 480 ttt cgc cct ggg cag gag cgt gca gtc atg cgg atc ctg tct ggc atc 1488 Phe Arg Pro Gly Gln Glu Arg Ala Val Met Arg Ile Leu Ser Gly Ile 485 490 495 tcc acg ctg ctg gtg ctg cct aca ggt gcc ggc aag tcc ctg tgc tac 1536 Ser Thr Leu Leu Val Leu Pro Thr Gly Ala Gly Lys Ser Leu Cys Tyr 500 505 510 cag ctc cca gcg ctg ctc tac agc cgg cgc agc ccc tgc ctc acg ttg 1584 Gln Leu Pro Ala Leu Leu Tyr Ser Arg Arg Ser Pro Cys Leu Thr Leu 515 520 525 gtc gtc tct ccc ctg ctg tca ctc atg gat gac cag gtg tct ggc ctg 1632 Val Val Ser Pro Leu Leu Ser Leu Met Asp Asp Gln Val Ser Gly Leu 530 535 540 cca ccg tgt ctc aag gcg gcc tgc ata cac tcg ggc atg acc agg aag 1680 Pro Pro Cys Leu Lys Ala Ala Cys Ile His Ser Gly Met Thr Arg Lys 545 550 555 560 caa cgg gaa tct gtc ctg cag aag att cgg gca gcc cag gta cac gtg 1728 Gln Arg Glu Ser Val Leu Gln Lys Ile Arg Ala Ala Gln Val His Val 565 570 575 ctg atg ctg aca cct gag gca ctg gtg ggg gcg gga ggc ctc cct cca 1776 Leu Met Leu Thr Pro Glu Ala Leu Val Gly Ala Gly Gly Leu Pro Pro 580 585 590 gcc gca cag ctg cct cca gtt gct ttt gcc tgc att gat gag gcc cac 1824 Ala Ala Gln Leu Pro Pro Val Ala Phe Ala Cys Ile Asp Glu Ala His 595 600 605 tgc ctc tcc cag tgg tcc cac aac ttc cgg ccc tgc tac ctg cgc gtc 1872 Cys Leu Ser Gln Trp Ser His Asn Phe Arg Pro Cys Tyr Leu Arg Val 610 615 620 tgc aag gtg ctt cgg gag cgc atg ggc gtg cac tgc ttc ctg ggc ctc 1920 Cys Lys Val Leu Arg Glu Arg Met Gly Val His Cys Phe Leu Gly Leu 625 630 635 640 aca gcc aca gcc aca cgc cgc act gcc agt gac gtg gca cag cac ctg 1968 Thr Ala Thr Ala Thr Arg Arg Thr Ala Ser Asp Val Ala Gln His Leu 645 650 655 gct gtg gct gaa gag cct gac ctc cac ggg cca gcc cca gtt ccc acc 2016 Ala Val Ala Glu Glu Pro Asp Leu His Gly Pro Ala Pro Val Pro Thr 660 665 670 aac ctg cac ctt tcc gtg tcc atg gac agg gac aca gac cag gca ctg 2064 Asn Leu His Leu Ser Val Ser Met Asp Arg Asp Thr Asp Gln Ala Leu 675 680 685 ttg acg ctg ctg caa ggc aaa cgt ttt caa aac ctc gat tcc att atc 2112 Leu Thr Leu Leu Gln Gly Lys Arg Phe Gln Asn Leu Asp Ser Ile Ile 690 695 700 att tac tgc aac cgg cgc gag gac aca gag cgg atc gct gcg ctc ctc 2160 Ile Tyr Cys Asn Arg Arg Glu Asp Thr Glu Arg Ile Ala Ala Leu Leu 705 710 715 720 cga acc tgc ctg cac gca gcc tgg gtc cca ggg tct gga ggt cgt gcc 2208 Arg Thr Cys Leu His Ala Ala Trp Val Pro Gly Ser Gly Gly Arg Ala 725 730 735 ccc aaa acc aca gcc gag gcc tac cac gcg ggc atg tgc agc cgg gaa 2256 Pro Lys Thr Thr Ala Glu Ala Tyr His Ala Gly Met Cys Ser Arg Glu 740 745 750 cgg cgg cgg gta cag cga gcc ttc atg cag ggc cag ttg cgg gtg gtg 2304 Arg Arg Arg Val Gln Arg Ala Phe Met Gln Gly Gln Leu Arg Val Val 755 760 765 gtg gcc acg gtg gcc ttt ggg atg ggg ctg gac cgg cca gat gtg cgg 2352 Val Ala Thr Val Ala Phe Gly Met Gly Leu Asp Arg Pro Asp Val Arg 770 775 780 gct gtg ctg cat ctg ggg ctg ccc cca agc ttc gag agc tac gtg cag 2400 Ala Val Leu His Leu Gly Leu Pro Pro Ser Phe Glu Ser Tyr Val Gln 785 790 795 800 gcc gtg ggc cgg gcc ggg cgt gac ggg cag cct gcc cac tgc cac ctc 2448 Ala Val Gly Arg Ala Gly Arg Asp Gly Gln Pro Ala His Cys His Leu 805 810 815 ttc ctg cag ccc cag ggc gaa gac ctg cga gag ctg cgc aga cat gtg 2496 Phe Leu Gln Pro Gln Gly Glu Asp Leu Arg Glu Leu Arg Arg His Val 820 825 830 cac gcc gac agc acg gac ttc ctg gct gtg aag agg ctg gta cag cgc 2544 His Ala Asp Ser Thr Asp Phe Leu Ala Val Lys Arg Leu Val Gln Arg 835 840 845 gtg ttc cca gcc tgc acc tgc acc tgc acc agg ccg ccc tcg gag cag 2592 Val Phe Pro Ala Cys Thr Cys Thr Cys Thr Arg Pro Pro Ser Glu Gln 850 855 860 gaa ggg gcc gtg ggt ggg gag agg cct gtg ccc aag tac ccc cct caa 2640 Glu Gly Ala Val Gly Gly Glu Arg Pro Val Pro Lys Tyr Pro Pro Gln 865 870 875 880 gag gct gag cag ctt agc cac caa gca gcc cca gga ccc aga agg gtc 2688 Glu Ala Glu Gln Leu Ser His Gln Ala Ala Pro Gly Pro Arg Arg Val 885 890 895 tgc atg ggc cat gag cgg gca ctc cca ata cag ctt acc gta cag gct 2736 Cys Met Gly His Glu Arg Ala Leu Pro Ile Gln Leu Thr Val Gln Ala 900 905 910 ttg gac atg ccg gag gag gcc atc gag act ttg ctg tgc tac ctg gag 2784 Leu Asp Met Pro Glu Glu Ala Ile Glu Thr Leu Leu Cys Tyr Leu Glu 915 920 925 ctg cac cca cac cac tgg ctg gag ctg ctg gcg acc acc tat acc cat 2832 Leu His Pro His His Trp Leu Glu Leu Leu Ala Thr Thr Tyr Thr His 930 935 940 tgc cgt ctg aac tgc cct ggg ggc cct gcc cag ctc cag gcc ctg gcc 2880 Cys Arg Leu Asn Cys Pro Gly Gly Pro Ala Gln Leu Gln Ala Leu Ala 945 950 955 960 cac agg tgt ccc cct ttg gct gtg tgc ttg gcc cag cag ctg cct gag 2928 His Arg Cys Pro Pro Leu Ala Val Cys Leu Ala Gln Gln Leu Pro Glu 965 970 975 gac cca ggg caa ggc agc agc tcc gtg gag ttt gac atg gtc aag ctg 2976 Asp Pro Gly Gln Gly Ser Ser Ser Val Glu Phe Asp Met Val Lys Leu 980 985 990 gtg gac tcc atg ggc tgg gag ctg gcc tct gtg cgg cgg gct ctc tgc 3024 Val Asp Ser Met Gly Trp Glu Leu Ala Ser Val Arg Arg Ala Leu Cys 995 1000 1005 cag ctg cag tgg gac cac gag ccc agg aca ggt gtg cgg cgt ggg aca 3072 Gln Leu Gln Trp Asp His Glu Pro Arg Thr Gly Val Arg Arg Gly Thr 1010 1015 1020 ggg gtg ctt gtg gag ttc agt gag ctg gcc ttc cac ctt cgc agc ccg 3120 Gly Val Leu Val Glu Phe Ser Glu Leu Ala Phe His Leu Arg Ser Pro 1025 1030 1035 1040 ggg gac ctg acc gct gag gag aag gac cag ata tgt gac ttc ctc tat 3168 Gly Asp Leu Thr Ala Glu Glu Lys Asp Gln Ile Cys Asp Phe Leu Tyr 1045 1050 1055 ggc cgt gtg cag gcc cgg gag cgc cag gcc ctg gcc cgt ctg cgc aga 3216 Gly Arg Val Gln Ala Arg Glu Arg Gln Ala Leu Ala Arg Leu Arg Arg 1060 1065 1070 acc ttc cag gcc ttt cac agc gta gcc ttc ccc agc tgc ggg ccc tgc 3264 Thr Phe Gln Ala Phe His Ser Val Ala Phe Pro Ser Cys Gly Pro Cys 1075 1080 1085 ctg gag cag cag gat gag gag cgc agc acc agg ctc aag gac ctg ctc 3312 Leu Glu Gln Gln Asp Glu Glu Arg Ser Thr Arg Leu Lys Asp Leu Leu 1090 1095 1100 ggc cgc tac ttt gag gaa gag gaa ggg cag gag ccg gga ggc atg gag 3360 Gly Arg Tyr Phe Glu Glu Glu Glu Gly Gln Glu Pro Gly Gly Met Glu 1105 1110 1115 1120 gac gca cag ggc ccc gag cca ggg cag gcc aga ctc cag gat tgg gag 3408 Asp Ala Gln Gly Pro Glu Pro Gly Gln Ala Arg Leu Gln Asp Trp Glu 1125 1130 1135 gac cag gtc cgc tgc gac atc cgc cag ttc ctg tcc ctg agg cca gag 3456 Asp Gln Val Arg Cys Asp Ile Arg Gln Phe Leu Ser Leu Arg Pro Glu 1140 1145 1150 gag aag ttc tcc agc agg gct gtg gcc cgc atc ttc cac ggc atc gga 3504 Glu Lys Phe Ser Ser Arg Ala Val Ala Arg Ile Phe His Gly Ile Gly 1155 1160 1165 agc ccc tgc tac ccg gcc cag gtg tac ggg cag gac cga cgc ttc tgg 3552 Ser Pro Cys Tyr Pro Ala Gln Val Tyr Gly Gln Asp Arg Arg Phe Trp 1170 1175 1180 aga aaa tac ctg cac ctg agc ttc cat gcc ctg gtg ggc ctg gcc acg 3600 Arg Lys Tyr Leu His Leu Ser Phe His Ala Leu Val Gly Leu Ala Thr 1185 1190 1195 1200 gaa gag ctc ctg cag gtg gcc cgc tga 3627 Glu Glu Leu Leu Gln Val Ala Arg 1205 4 21 DNA Artificial Sequence PCR Primer 4 tctcccctgc tgtcactcat g 21 5 18 DNA Artificial Sequence PCR Primer 5 cccgttgctt cctggtca 18 6 23 DNA Artificial Sequence PCR Probe 6 tcaaggcggc ctgcatacac tcg 23 7 19 DNA Artificial Sequence PCR Primer 7 gaaggtgaag gtcggagtc 19 8 20 DNA Artificial Sequence PCR Primer 8 gaagatggtg atgggatttc 20 9 20 DNA Artificial Sequence PCR Probe 9 caagcttccc gttctcagcc 20 10 6462 DNA Homo sapiens 10 gcattggctg tcggcccccg cgacggctgc gcgggagatt cgctggacga tcgcaagcgc 60 ggaggccggg cgggcgcgcg cgccatggag cggctgcggg acgtgcggga gcggctgcag 120 gcgtgggagc gcgcgttccg acggcagcgc gggcggcgac cgagccaggt gcgggctgcc 180 caggggccga ggggctgagg gcgcggcccg cggctgacgc gttcccttta caggacgacg 240 tggaggcggc gccggaggag acccgcggtg agcgcgcggc ggggcggcgg gggcgagaag 300 acaccgggtc ggcaggggcc caggccccac cctgaccccg cctcccgctc gcccacgcag 360 cgctctaccg ggagtaccgc actctgaagc gtaccacggg ccaggccggc ggcgggctcc 420 gcagctccga gtcgctcccc gcggcggccg aagaggtacc caggccccgc cgccccagcc 480 tcctcccact tccctgtttg gcggagtggc gggagccacg gagtcgcggc caggcctccg 540 tggggcacag aacttgggag ggggactggg caaagtgaag aagggccggg cctcgctcca 600 ggtgcgggag gggtggctgg gagcgcttct gccgccacaa cagccttttc tggcctgtgc 660 ccctgttgtc tcctgcaggc gccagagccc cgctgctggg ggccccatct gaatcgggct 720 gcgaccaaga gtccacagcc tacgccaggg cggagccgcc agggctcggt gccggactac 780 gggcagcggc tcaaggccaa tctgaaaggc accctgcagg tgaggagtgg gcaggcagtg 840 agtccacgct aggtccacag ctgcttccgg tccgggtcgc cctcttgtca ttttttccac 900 acagacaggc acgggcccct gtgccaacca gggcacgagt cttcagggag cttctcgggg 960 ccttcgccct tgactccctt tctagtccag ccttgtgcta attagcctgc tctacaattg 1020 agcgtgggga ctcaggtagg ttttagagtc tacagtagct caggggcctg agttcctcct 1080 gctgttctgc tgttcccctc ccaggccgga ccagccctgg gccgcagacc gtggcctcta 1140 ggaagagcct catctaaggc atccacccca aagcccccag gtacagggcc tgtcccctcc 1200 tttgcagaaa aagtcagtga tgagcctcca cagctccctg agccccagcc aaggccaggc 1260 cggctccagc atctgcaggc atccctgagc cagcggctgg gctccctaga tcctggctgg 1320 ttacagcgat gtcacagtga ggtcccagat tttctggggg cccccaaagc ctgcaggcct 1380 gatctaggct cagaggaatc acaacttctg atccctggtg agtcggctgt ccttggtcct 1440 ggtgctggct cccagggccc agaggcttca gccttccaag aagtcagcat ccgtgtgggg 1500 agcccccagc ccagcagcag tggaggcgag aagcggagat ggaacgagga gccctgggag 1560 agccccgcac aggtccagca ggagagcagc caagctggac ccccatcgga gggggctggg 1620 gctgtagcag ttgaggaaga ccctccaggg gaacctgtac aggcacagcc acctcagccc 1680 tgcagcagcc catcgaaccc caggtaccac ggactcagcc cctccagtca agctagggct 1740 gggaaggctg agggcacagc ccccctgcac atcttccctc ggctggcccg ccatgacagg 1800 ggcaattacg tacggctcaa catgaagcag aaacactacg tgcggggccg ggcactccgt 1860 agcaggctcc tccgcaagca ggtaagacag cgacgggcca ggacaggcat tccctttccc 1920 tcccctcagc cctcccgtat ttcccgccca gtgaccctcc tatgtgggca ccccccaggc 1980 atggaagcag aagtggcgga agaaagggga gtgttttggg ggtggtggtg ccacagtcac 2040 aaccaaggag tcttgtttcc tgaacgagca gttcgatcac tgggcagccc agtgtccccg 2100 gccaggtgag acatctgccc tggagggtgg gtccggccaa cactgtggag agggcgcagt 2160 gctcttttgg gggacactta tgttccaagc aacaggcctt ccaggtaccc ctggtccagg 2220 ccctacccta gctcccctga aggagggtgg cagggacgac gatggctgtc actcttttct 2280 gctttggaaa aagtagccca gaggaagggc actgcctgct gccaaccccc tttgggggaa 2340 ggagaggttg tggccagtgg ttgtcttgcc cgacctggag ctcccattct accctctcct 2400 gcctgcccca gcaagtgagg aagacacaga tgctgttggg cctgagccac tggttccttc 2460 accacaacct gtacctgagg tgcccagcct ggaccccacc gtgctgccac tctactccct 2520 ggggccctca gggcagttgg caggtgagca gtcagcttct ggcccagagc cttcactgag 2580 gggttggggt gactcaagtc atggtgatca acatctgtgt ctgcagagac gccggctgag 2640 gtgttccagg ccctggagca gctggggcac caagcctttc gccctgggca ggagcgtgca 2700 gtcatgcgga tcctgtctgg tgagcgtggc tgccagggct gaggctgggc tgaggccagg 2760 ctgcagaacc ctgctgctga ctcccgcccc atccaggcat ctccacgctg ctggtgctgc 2820 ctacaggtgc cggcaagtcc ctgtgctacc agctcccagc gctgctctac agccggcgca 2880 gcccctgcct cacgttggtc gtctctcccc tgctgtcact catggatgac caggtgtgca 2940 cacagggccc tgggcacacg tacacagcca agaaccagca cttgtgactc ccaagggcaa 3000 ctgctgcttg tcccctaacc accccctccc ctgggagctt caaggtgtct gtggcctcag 3060 tcccagtctt ggcagcaggt caaaggcagc ccagctccac aggcaccaca gccaccccta 3120 cgggaaatgt gctgggaaag gagccatccc tacttcagtc tgtctgctct ggggctcctg 3180 ggccaaggcc cacaggtggc tctaaaccct tagccctagg acccaggacc tggttctcct 3240 ctcccctgag ggactaggat ggacatggca gcagatctgg gatgacttgg ggaagggcca 3300 gggctgggct ggcgtatgac ggctgtcgtt cctgcatttg caggtgtctg gcctgccacc 3360 gtgtctcaag gcggcctgca tacactcggg catgaccagg aagcaacggg aatctgtcct 3420 gcagaaggtg ggggcctcat gggcctaggg gtgagggagg cagcgggcgg gcacctgggc 3480 tgtgcctctg atcttgctgc cttcagattc gggcagccca ggtacacgtg ctgatgctga 3540 cacctgaggc actggtgggg gcgggaggcc tccctccagc cgcacagctg cctccagttg 3600 cttttgcctg cattgatgag gcccactgcc tctcccagtg gtcccacaac ttccggccct 3660 gctacctgcg cgtctgcaag gtgagccata tgtgaactgg ggtgggcggc cagggccggg 3720 atgggctggg cggcctcaca ccactgccgc ctctggtgca ggtgcttcgg gagcgcatgg 3780 gcgtgcactg cttcctgggc ctcacagcca cagccacacg ccgcactgcc agtgacgtgg 3840 cacagcacct ggctgtggct gaagagcctg acctccacgg gccagcccca gttcccacca 3900 acctgcacct ttccgtgtcc atggacaggg acacagacca ggtgggtgtg tgtgctctgg 3960 ggaccctgca gggccctggc tgctgactgc ccacgccgac ccctcctcac tccccactgc 4020 ccacgccaac cgctcctcat caggcactgt tgacgctgct gcaaggcaaa cgttttcaaa 4080 acctcgattc cattatcatt tactgcaacc ggcgcgagga cacagagcgg atcgctgcgc 4140 tcctccgaac ctgcctgcac gcagcctggg tcccagggtc tggaggtgcg gcatggacag 4200 agctggtgtc cccgtggacc caccttgggc acacatggtc ccatcccact gaccatctgc 4260 ctgtcttccc caaaggtcgt gcccccaaaa ccacagccga ggcctaccac gcgggcatgt 4320 gcagccggga acggcggcgg gtacagcgag ccttcatgca gggccagttg cgggtggtgg 4380 tggccacggt ggcctttggg atggggctgg accggccaga tgtgcgggct gtgctgcatc 4440 tggggctgcc cccaagcttc gagagctacg tgcaggccgt gggccgggcc gggcgtgacg 4500 ggcagcctgc ccactgccac ctcttcctgc agccccaggt tggcaccccc cccccacact 4560 gccagtgctc gagcccccag tggtccaccc caccctcatg aaagttgccc tgcagggcga 4620 agacctgcga gagctgcgca gacatgtgca cgccgacagc acggacttcc tggctgtgaa 4680 gaggctggta cagcgcgtgt tcccagcctg cacctgcacc tgcaccaggc cgccctcgga 4740 gcaggaaggg gccgtgggtg gggagaggcc tgtgcccaag tacccccctc aagaggctga 4800 gcagcttagc caccaagcag ccccaggacc cagaagggtc tgcatgggcc atgagcgggc 4860 actcccaata cagcttaccg tacaggcttt ggacatgccg gaggagggtg aggaacctgg 4920 ggtaagccac aggggtgtgg aggggctgtc cccgcgtccg ctgagccctg ctctgccccc 4980 agccatcgag actttgctgt gctacctgga gctgcaccca caccactggc tggagctgct 5040 ggcgaccacc tatacccatt gccgtctgaa ctgccctggg ggccctgccc agctccaggc 5100 cctggcccac aggtaagcac gccctgccca gttggagacg aggttggaga atcagggctg 5160 ttggccacat gtcccttttt ccctgggcac aggtgtcccc ctttggctgt gtgcttggcc 5220 cagcagctgc ctgaggaccc agggcaaggc agcagctccg tggagtttga catggtcaag 5280 ctggtggact ccatgggctg ggagctggcc tctgtgcggc gggctctctg ccagctgcag 5340 tgggaccacg agcccaggac aggtgcgcct ctccccaccc cacaccgccc tggacgctgc 5400 ctgcctgcat ctgacatgct ttccggcagg tgtgcggcgt gggacagggg tgcttgtgga 5460 gttcagtgag ctggccttcc accttcgcag cccgggggac ctgaccgctg aggagaagga 5520 ccagatatgt gacttcctct atggccgtgt gcaggcccgg gagcgccagg ccctggcccg 5580 tctgcgcaga accttccagg cctttcacag gttgggagga ggtgggcggg gcctgggacc 5640 atccaccctc ccgcagtgat cagctctgac aggctcctcc ccacagcgta gccttcccca 5700 gctgcgggcc ctgcctggag cagcaggatg aggagcgcag caccaggctc aaggacctgc 5760 tcggccgcta ctttgaggaa gaggaagggc aggagccggg aggcatggag gacgcacagg 5820 gccccgagcc agggcaggcc agagtgagtg tagtaaggcc aggcagctca tcggggttgc 5880 aggttccctg ggctgcatgg ggcttgctct gtggatgcag tgccacggga gctcagagga 5940 agcctgatgt gcctgtccac acagctccag gattgggagg accaggtccg ctgcgacatc 6000 cgccagttcc tgtccctgag gccagaggag aagttctcca gcagggctgt ggcccgcatc 6060 ttccacggca tcggtgaggc ctgggaggcc ccacccactg caggctgggg ctgggggctg 6120 gggcaggtga ggcctgggag gctccacccg ctgcaggctg gggctggggc tcacggctgt 6180 gtcttggctc caccgtagga agcccctgct acccggccca ggtgtacggg caggaccgac 6240 gcttctggag aaaatacctg cacctgagct tccatgccct ggtgggcctg gccacggaag 6300 agctcctgca ggtggcccgc tgactgcact gcattggggg atgtcgggta gagctggggt 6360 tgtcagaggc tagggcagtg actgaggacc tgggcaaaac ctgccacagg gtgtgggaac 6420 gaggaggctc caaaatgcag aataaaaaat gctcactttg tt 6462 11 223 DNA Homo sapiens 11 cggaagagct cctgcaggtg gcccgctgac tgcactgcat tgggggatgt cgggtagagc 60 tggggttgtc agaggctagg gcagtgactg aggacctggg caaaacctgc cacagggtgt 120 gggaacgagg aggctccaaa atgcaaaaat aaaaaaatgc tcactttgtt aaaaaaaaaa 180 aaaaaaaaaa aaaaaaaaaa aaaaaaaaaa aaaaaaaaaa aag 223 12 20 DNA Artificial Sequence Antisense Oligonucleotide 12 tctgacaacc ccagctctac 20 13 20 DNA Artificial Sequence Antisense Oligonucleotide 13 agtcactgcc ctagcctctg 20 14 20 DNA Artificial Sequence Antisense Oligonucleotide 14 tttgcccagg tcctcagtca 20 15 20 DNA Artificial Sequence Antisense Oligonucleotide 15 ttggagcctc ctcgttccca 20 16 20 DNA Artificial Sequence Antisense Oligonucleotide 16 ctggtccggc ctgcagggtg 20 17 20 DNA Artificial Sequence Antisense Oligonucleotide 17 cacggtctgc ggcccagggc 20 18 20 DNA Artificial Sequence Antisense Oligonucleotide 18 ctcttcctag aggccacggt 20 19 20 DNA Artificial Sequence Antisense Oligonucleotide 19 gagctgtgga ggctcatcac 20 20 20 DNA Artificial Sequence Antisense Oligonucleotide 20 ggagccggcc tggccttggc 20 21 20 DNA Artificial Sequence Antisense Oligonucleotide 21 ggacctcact gtgacatcgc 20 22 20 DNA Artificial Sequence Antisense Oligonucleotide 22 ggagcgaggc ccggcccttc 20 23 20 DNA Artificial Sequence Antisense Oligonucleotide 23 ccccagaaaa tctgggacct 20 24 20 DNA Artificial Sequence Antisense Oligonucleotide 24 ctccactgct gctgggctgg 20 25 20 DNA Artificial Sequence Antisense Oligonucleotide 25 agggctcctc gttccatctc 20 26 20 DNA Artificial Sequence Antisense Oligonucleotide 26 gtacgtaatt gcccctgtca 20 27 20 DNA Artificial Sequence Antisense Oligonucleotide 27 aactcaggcc cctgagctac 20 28 20 DNA Artificial Sequence Antisense Oligonucleotide 28 gaggagcctg ctacggagtg 20 29 20 DNA Artificial Sequence Antisense Oligonucleotide 29 gcttgcggag gagcctgcta 20 30 20 DNA Artificial Sequence Antisense Oligonucleotide 30 tccatgcctg cttgcggagg 20 31 20 DNA Artificial Sequence Antisense Oligonucleotide 31 gcttccatgc ctgcttgcgg 20 32 20 DNA Artificial Sequence Antisense Oligonucleotide 32 cacttctgct tccatgcctg 20 33 20 DNA Artificial Sequence Antisense Oligonucleotide 33 ggctgcccag tgatcgaact 20 34 20 DNA Artificial Sequence Antisense Oligonucleotide 34 gcccaacagc atctgtgtct 20 35 20 DNA Artificial Sequence Antisense Oligonucleotide 35 cgtggagatg ccagacagga 20 36 20 DNA Artificial Sequence Antisense Oligonucleotide 36 gacgaccaac gtgaggcagg 20 37 20 DNA Artificial Sequence Antisense Oligonucleotide 37 aggccagaca cctggtcatc 20 38 20 DNA Artificial Sequence Antisense Oligonucleotide 38 tgagacacgg tggcaggcca 20 39 20 DNA Artificial Sequence Antisense Oligonucleotide 39 ggtcatgccc gagtgtatgc 20 40 20 DNA Artificial Sequence Antisense Oligonucleotide 40 gctgcccgaa tcttctgcag 20 41 20 DNA Artificial Sequence Antisense Oligonucleotide 41 ccaccagtgc ctcaggtgtc 20 42 20 DNA Artificial Sequence Antisense Oligonucleotide 42 ggagaggcag tgggcctcat 20 43 20 DNA Artificial Sequence Antisense Oligonucleotide 43 cccgaagcac cttgcagacg 20 44 20 DNA Artificial Sequence Antisense Oligonucleotide 44 gcagtgcacg cccatgcgct 20 45 20 DNA Artificial Sequence Antisense Oligonucleotide 45 gccacgtcac tggcagtgcg 20 46 20 DNA Artificial Sequence Antisense Oligonucleotide 46 agccacagcc aggtgctgtg 20 47 20 DNA Artificial Sequence Antisense Oligonucleotide 47 tggacacgga aaggtgcagg 20 48 20 DNA Artificial Sequence Antisense Oligonucleotide 48 gtcaacagtg cctggtctgt 20 49 20 DNA Artificial Sequence Antisense Oligonucleotide 49 ccctccaggg cagatgtctc 20 50 20 DNA Artificial Sequence Antisense Oligonucleotide 50 gccggttgca gtaaatgata 20 51 20 DNA Artificial Sequence Antisense Oligonucleotide 51 gggtacctgg aaggcctgtt 20 52 20 DNA Artificial Sequence Antisense Oligonucleotide 52 ggtaggcctc ggctgtggtt 20 53 20 DNA Artificial Sequence Antisense Oligonucleotide 53 atgcccgcgt ggtaggcctc 20 54 20 DNA Artificial Sequence Antisense Oligonucleotide 54 cgcaactggc cctgcatgaa 20 55 20 DNA Artificial Sequence Antisense Oligonucleotide 55 tcccaaaggc caccgtggcc 20 56 20 DNA Artificial Sequence Antisense Oligonucleotide 56 cacggcctgc acgtagctct 20 57 20 DNA Artificial Sequence Antisense Oligonucleotide 57 gggcaggctg cccgtcacgc 20 58 20 DNA Artificial Sequence Antisense Oligonucleotide 58 gcacatgtct gcgcagctct 20 59 20 DNA Artificial Sequence Antisense Oligonucleotide 59 ctgtaccagc ctcttcacag 20 60 20 DNA Artificial Sequence Antisense Oligonucleotide 60 caggtgcagg ctgggaacac 20 61 20 DNA Artificial Sequence Antisense Oligonucleotide 61 ctggtgcagg tgcaggtgca 20 62 20 DNA Artificial Sequence Antisense Oligonucleotide 62 catgcagacc cttctgggtc 20 63 20 DNA Artificial Sequence Antisense Oligonucleotide 63 agtgcccgct catggcccat 20 64 20 DNA Artificial Sequence Antisense Oligonucleotide 64 gctgtattgg gagtgcccgc 20 65 20 DNA Artificial Sequence Antisense Oligonucleotide 65 tccaaagcct gtacggtaag 20 66 20 DNA Artificial Sequence Antisense Oligonucleotide 66 gtctcgatgg cctcctccgg 20 67 20 DNA Artificial Sequence Antisense Oligonucleotide 67 ggtgcagctc caggtagcac 20 68 20 DNA Artificial Sequence Antisense Oligonucleotide 68 cagcagctcc agccagtggt 20 69 20 DNA Artificial Sequence Antisense Oligonucleotide 69 ccatgtcaaa ctccacggag 20 70 20 DNA Artificial Sequence Antisense Oligonucleotide 70 agtccaccag cttgaccatg 20 71 20 DNA Artificial Sequence Antisense Oligonucleotide 71 agctcccagc ccatggagtc 20 72 20 DNA Artificial Sequence Antisense Oligonucleotide 72 gtcccactgc agctggcaga 20 73 20 DNA Artificial Sequence Antisense Oligonucleotide 73 cgccgcacac ctgtcctggg 20 74 20 DNA Artificial Sequence Antisense Oligonucleotide 74 aggtggaagg ccagctcact 20 75 20 DNA Artificial Sequence Antisense Oligonucleotide 75 cagcggtcag gtcccccggg 20 76 20 DNA Artificial Sequence Antisense Oligonucleotide 76 tcacatatct ggtccttctc 20 77 20 DNA Artificial Sequence Antisense Oligonucleotide 77 gcctgcacac ggccatagag 20 78 20 DNA Artificial Sequence Antisense Oligonucleotide 78 gaaggctacg ctgtgaaagg 20 79 20 DNA Artificial Sequence Antisense Oligonucleotide 79 caatcctgga gtctggcctg 20 80 20 DNA Artificial Sequence Antisense Oligonucleotide 80 cctcccaatc ctggagtctg 20 81 20 DNA Artificial Sequence Antisense Oligonucleotide 81 ggacaggaac tggcggatgt 20 82 20 DNA Artificial Sequence Antisense Oligonucleotide 82 ggccacagcc ctgctggaga 20 83 20 DNA Artificial Sequence Antisense Oligonucleotide 83 gaagatgcgg gccacagccc 20 84 20 DNA Artificial Sequence Antisense Oligonucleotide 84 cagcgggcca cctgcaggag 20 85 20 DNA Artificial Sequence Antisense Oligonucleotide 85 catatggctc accttgcaga 20 86 20 DNA Artificial Sequence Antisense Oligonucleotide 86 gcagtcagca gccagggccc 20 87 20 DNA Artificial Sequence Antisense Oligonucleotide 87 tgtgcccaag gtgggtccac 20 88 20 DNA Artificial Sequence Antisense Oligonucleotide 88 aagacaggca gatggtcagt 20 89 20 DNA Artificial Sequence Antisense Oligonucleotide 89 cacctgtgcc cagggaaaaa 20 

What is claimed is:
 1. A compound 8 to 50 nucleobases in length targeted to a nucleic acid molecule encoding RECQL4, wherein said compound specifically hybridizes with and inhibits the expression of RECQL4.
 2. The compound of claim 1 which is an antisense oligonucleotide.
 3. The compound of claim 2 wherein the antisense oligonucleotide has a sequence comprising SEQ ID NO: 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86 or
 88. 4. The compound of claim 2 wherein the antisense oligonucleotide comprises at least one modified internucleoside linkage.
 5. The compound of claim 4 wherein the modified internucleoside linkage is a phosphorothioate linkage.
 6. The compound of claim 2 wherein the antisense oligonucleotide comprises at least one modified sugar moiety.
 7. The compound of claim 6 wherein the modified sugar moiety is a 2′-O-methoxyethyl sugar moiety.
 8. The compound of claim 2 wherein the antisense oligonucleotide comprises at least one modified nucleobase.
 9. The compound of claim 8 wherein the modified nucleobase is a 5-methylcytosine.
 10. The compound of claim 2 wherein the antisense oligonucleotide is a chimeric oligonucleotide.
 11. A compound 8 to 50 nucleobases in length which specifically hybridizes with at least an 8-nucleobase portion of an active site on a nucleic acid molecule encoding RECQL4.
 12. A composition comprising the compound of claim 1 and a pharmaceutically acceptable carrier or diluent.
 13. The composition of claim 12 further comprising a colloidal dispersion system.
 14. The composition of claim 12 wherein the compound is an antisense oligonucleotide.
 15. A method of inhibiting the expression of RECQL4 in cells or tissues comprising contacting said cells or tissues with the compound of claim 1 so that expression of RECQL4 is inhibited.
 16. A method of treating an animal having a disease or condition associated with RECQL4 comprising administering to said animal a therapeutically or prophylactically effective amount of the compound of claim 1 so that expression of RECQL4 is inhibited.
 17. The method of claim 16 wherein the disease or condition is a hyperproliferative condition.
 18. The method of claim 17 wherein the hyperproliferative condition is cancer.
 19. The method of claim 16 wherein the disease or condition results from viral infection.
 20. The method of claim 16 wherein the disease or condition involves premature aging. 